Aesthetic Threads Knowledge Center: Complete Guide to PDO, PCL and PLLA Threads

Aesthetic threads are absorbable suture materials designed for non-surgical facial lifting and tissue stimulation. Over the past two decades, thread lifting has grown from a niche technique into one of the most requested non-surgical procedures in aesthetic medicine — and with that growth, the range of materials, thread designs and clinical protocols has expanded dramatically.

This knowledge center is the complete reference for practitioners: the three core materials (PDO, PCL and PLLA), every thread design from mono to cog, screw, molding and beyond, area-by-area application guidance, how to choose, comparison, longevity, aftercare and safety. Whether you are adding thread lifting to a new clinic or deepening an existing menu, this guide gives you the full picture in one place — written for licensed practitioners, by a professional-grade thread manufacturer.

What Are Aesthetic Threads?

What Are Aesthetic Threads?

Aesthetic threads (also called cosmetic threads, lifting threads or PDO threads) are medical-grade absorbable filaments inserted beneath the skin using fine needles or blunt cannulas. They are manufactured from biocompatible, absorbable polymers — most commonly polydioxanone (PDO), polycaprolactone (PCL) and poly-L-lactic acid (PLLA) — the same families of materials that have been used safely in absorbable surgical sutures for decades.

The concept is simple: a fine thread is placed in the subcutaneous or subdermal plane, where it performs two jobs at once. First, it provides immediate mechanical support — barbed designs physically anchor and lift tissue. Second, it stimulates the tissue's own repair response, prompting the production of new collagen and elastin over the following weeks and months. The result is a combination of immediate lift and progressive skin improvement, without surgery.

Key properties of aesthetic threads:

• Fully absorbable — no permanent implant remains in the body
• Biocompatible — the polymer families have long clinical histories in surgery
• Versatile — available in many gauges (18G to 30G), lengths (13 mm to 140 mm) and designs
• Reversible over time — effects fade gradually as the material absorbs, allowing natural aging to continue

What Is Thread Lifting?

Thread lifting is a non-surgical aesthetic procedure in which absorbable threads are placed beneath the skin to lift, tighten and rejuvenate facial tissue. It is performed by licensed practitioners, typically under local anaesthesia, and takes roughly 30 to 60 minutes depending on the treatment area.

Thread lifting is often positioned as a bridge between injectable treatments and surgical facelift:

Dimension	Thread Lifting	Surgical Facelift
Anaesthesia	Local	General or deep sedation
Incisions	None (needle or cannula entry points)	Significant incisions
Downtime	24–48 hours	1–2+ weeks
Immediate lift	Moderate, visible	Dramatic
Duration of effect	6–24 months (material-dependent)	8–15 years
Cost	Fraction of surgery	High
Suitability	Mild-to-moderate laxity	Advanced laxity

For many patients, thread lifting offers the majority of the perceived benefit of a lift — a refreshed, elevated appearance — with a fraction of the risk, cost and recovery time.

How Threads Work: The Dual Mechanism

Understanding the mechanism is essential for selecting the right thread. Threads work through two complementary processes:

1. Mechanical lifting (immediate). Threads with barbs, cogs, cones or 3D structures grip the surrounding tissue the moment they are placed. When the thread is pulled taut and anchored, it physically repositions sagging tissue — visible immediately. This is the "lift" part of the procedure, and it is why cog and molding threads are the workhorses of thread lifting.

2. Biological stimulation (progressive). The absorbable material itself triggers a controlled, low-grade tissue response along the thread channel. This response stimulates fibroblasts to produce collagen and elastin, thickening the dermis and improving skin firmness and quality over 4 to 12 weeks. This is the "rejuvenation" part — and it is why even smooth mono threads, with no lifting action at all, deliver meaningful results.

The two mechanisms overlap: a cog thread lifts immediately and continues to stimulate collagen as it absorbs; a mono thread stimulates collagen from day one and never lifts mechanically. Choosing a thread therefore means choosing how much of each effect you want.

Lifting Threads vs Collagen-Stimulating Threads

Every thread design can be placed into one of two functional families:

• Lifting threads — cog, molding, fishbone, tornado and 4D/6D designs. Barbed or 3D structures provide strong mechanical anchoring and immediate lift. Used for the brow, jawline, cheeks, midface and neck.
• Collagen-stimulating threads — mono, multi and screw designs. Smooth or twisted filaments maximize tissue contact and collagen response with little or no mechanical lift. Used for skin quality, fine lines, laxity without sagging, and delicate areas.

The distinction matters for patient communication: a patient who wants a visible lift needs a lifting thread; a patient who wants better skin quality over time may be better served by a collagen-stimulating thread — or a combination of both, which is increasingly the standard of care.

Who Is Thread Lifting For?

In brief, the ideal thread lift candidate is an adult with mild-to-moderate facial laxity who wants a non-surgical lift, has realistic expectations, and is healthy enough for a minor procedure. Full candidacy guidance — including contraindications — is covered later in this guide.

For a deeper look at each material, see our dedicated PDO Threads Guide, PCL Threads Guide and PLLA Threads Guide.

Thread Materials: PDO, PCL and PLLA

Three materials dominate the professional aesthetic thread market. Each has a different absorption profile, collagen response, duration and best-use scenario. This section explains the science and the clinical logic behind each material.

PDO Threads

What Are PDO Threads? PDO (polydioxanone) threads are made from a polyester polymer that has been used in absorbable surgical sutures since the 1980s. That long clinical history is the foundation of PDO's reputation: it is the most widely used aesthetic thread material worldwide, the most studied, and the standard entry point for clinics adding thread lifting to their menu.

PDO Material Characteristics. PDO absorbs by hydrolysis over approximately 6 to 8 months. It offers:

• Predictable, complete absorption with excellent tissue compatibility
• A strong immediate lifting effect in barbed and cog designs
• The widest range of gauges (18G–30G) and lengths (13 mm–140 mm) of any material
• Proven collagen stimulation during the absorption window

How PDO Threads Work. Placed in the subdermal plane, PDO threads anchor tissue mechanically (in cog designs) and stimulate neocollagenesis as they degrade. The lifting effect is typically visible for 6 to 12 months; skin-quality benefits — firmness, texture, pore refinement — often outlast the material itself and are the reason many patients return for maintenance sessions.

PDO Thread Benefits:

• Fast, visible results from the first session
• Long safety track record in surgery and aesthetics
• Extremely versatile — suitable for almost every facial area
• Natural-looking outcomes with no permanent changes
• Most cost-effective material for patients and clinics
• Low complication profile in trained hands

PDO Thread Considerations:

• Effect duration is shorter than PCL and PLLA (6–12 months typical)
• Maintenance sessions are usually needed to sustain results
• Strong mechanical lift requires correct gauge selection (thicker = stronger)

Common PDO Thread Types. Smooth mono threads for skin rejuvenation; cog threads (including 4D/6D) for lifting; screw threads for volume support; and specialized designs for the nose, eye area and brow. A full PDO range typically spans mono, cog, screw, molding, multi, double needle, fishbone, tornado and eye designs across multiple gauges.

Medical vs Cosmetic Grade. For professional use, medical-grade threads are non-negotiable: sterile manufacturing, validated quality systems, and regulatory documentation (CE-Marked for EU markets). Cosmetic-grade products without certification have no place in clinical practice. Verify batch documentation with your supplier before every order.

Browse the PDO Threads Collection for medical-grade options, or read the PDO Threads Guide for a deeper technical review.

PCL Threads

What Are PCL Threads? PCL (polycaprolactone) threads are made from a slower-absorbing polymer that remains in the tissue for approximately 18 to 24 months — roughly three times longer than PDO.

PCL Material Properties. PCL is a strong, flexible, hydrophobic polymer whose degradation profile is fundamentally different from PDO's:

• Absorption over 18–24 months, with a long collagen-stimulation window
• Sustained structural support throughout that period
• Excellent tensile strength — suitable for areas under repeated movement
• A "biostimulatory" profile valued for long-term tissue improvement

How PCL Threads Work. Because PCL absorbs slowly, it stimulates collagen production over a much longer period than PDO. The clinical consequence: results build progressively and last significantly longer — often 18 to 24 months from a single procedure. This makes PCL the material of choice when the goal is durability and fewer repeat sessions.

PCL Thread Benefits:

• Longest-lasting results of the three materials (18–24 months)
• Sustained collagen stimulation for progressive skin improvement
• Strong support for high-movement areas (neck, jawline)
• Fewer maintenance sessions — lower long-term cost per patient
• Excellent for combination protocols with PDO (fast lift + long support)

PCL Thread Considerations:

• Effects build more gradually — the full result takes weeks to appear
• Higher material cost than PDO
• Less "instant lift" perception — patient education is important

PCL vs PDO: The Core Difference. Duration. PDO gives a faster, more immediate lift with 6–12 months of effect; PCL provides a gradual but longer-lasting outcome with sustained collagen stimulation. Many practitioners use PDO cog threads for the immediate lift and PCL for areas where long-term support matters most — the neck, midface and jowls.

Browse the PCL Threads Collection for medical-grade options, or read the PCL Threads Guide for a deeper technical review.

PLLA Threads

What Are PLLA Threads? PLLA (poly-L-lactic acid) threads are made from a biodegradable polymer with a long history in aesthetic medicine — the same family used in well-known collagen-stimulating injectables. PLLA threads absorb over roughly 12 to 24 months and are valued primarily for biostimulation rather than mechanical lifting.

PLLA Material Characteristics.

• Potent collagen biostimulator — the strongest of the three materials
• Absorption over 12–24 months with progressive tissue response
• Gentle on tissue — minimal immediate mechanical effect
• Ideal for patients who prioritize long-term skin improvement over instant lift

PLLA Collagen Stimulation: How It Works. As PLLA degrades, it drives a sustained fibroblast response that thickens the dermis, improves firmness, and gradually restores volume. Results build over weeks to months and peak well after placement. PLLA is the material of choice for:

• Skin quality and texture improvement
• Gradual, natural volume restoration
• Long-term collagen building in aging skin
• Patients who want "better skin," not just "a lift"

PLLA vs PDO: Lifting vs Biostimulation. PDO acts fast with a visible lift and a shorter duration; PLLA acts slowly with a subtler but longer-lasting tissue improvement. The two are complementary, and advanced protocols routinely combine PDO cog threads (immediate lift) with PLLA threads (sustained collagen) — the patient gets both an immediate change and a progressive one.

PLLA Thread Considerations:

• No significant mechanical lift — expectations must be managed
• Results require patience (weeks to months to build)
• Best results usually require combination or staged protocols

Browse the PLLA Threads Collection for medical-grade options, or read the PLLA Threads Guide for a deeper technical review.

Material Comparison at a Glance

Material	Absorption	Duration of Effect	Main Mechanism	Lifting Power	Skin-Quality Effect	Typical Price Point
PDO	~6–8 months	6–12 months	Immediate lift + collagen	Strong	Moderate	Entry level
PCL	~18–24 months	18–24 months	Long collagen stimulation	Moderate-strong	High	Mid
PLLA	~12–24 months	12–24 months	Strong biostimulation	Low	Highest	Premium

Practical summary:

• Fast, visible, affordable → PDO
• Long-lasting, fewer sessions → PCL
• Gradual, skin-quality focused, premium → PLLA
• The complete protocol → PDO (lift) + PCL or PLLA (long-term support)

Thread Types and Structures

Aesthetic threads are manufactured in many designs, each engineered for a specific mechanical action. Understanding the difference between a mono thread and a cog thread is the single most important technical concept in thread lifting. This section covers every major design used in professional practice.

Mono Threads

What Are Mono Threads? Mono threads are single, smooth filaments with no barbs, spirals or texturing. They are the classic skin-rejuvenation thread: fine, gentle and purely collagen-stimulating.

How Mono Threads Work. Without any anchoring structure, mono threads do not lift mechanically. Their entire contribution is biological: the filament stimulates collagen production along its channel, improving skin quality, firmness and fine lines over 4–12 weeks.

Typical Uses. Fine lines and crepey skin, skin-quality improvement, forehead and cheek texture, and as a finishing layer in combination protocols. Mono threads are also the safest choice for patients who are new to threads or have thin skin.

Specifications to Know. Mono threads typically range from 26G to 30G in 13 mm to 90 mm lengths — finer and shorter than lifting threads. Choosing a finer gauge reduces tissue trauma in delicate areas.

Common Misconception. "Mono threads don't do anything." In fact, their collagen effect is significant — they simply don't lift. They are not a weak cog thread; they are a different tool.

Browse the Mono Threads Collection for available sizes and packaging.

Cog Threads

What Are Cog Threads? Cog threads (also called barbed threads) carry small, angled barbs along the filament that anchor into tissue and provide strong mechanical lifting. They are the primary tool for immediate, visible lifting.

How Cog Threads Work. After placement, the practitioner pulls the thread taut and anchors it — the barbs grip the surrounding tissue like small hooks, physically lifting and holding it in position. The lift is visible immediately and improves further as the tissue adapts and collagen forms around the barbs.

Cog Thread Variants:

• Unidirectional cogs — barbs face one direction; used for one-way lifting along a single vector
• Bidirectional cogs — barbs face two directions from a central point; both ends anchor, offering two-directional lift from one thread
• 4D cog threads — multiple barb rows around the filament for stronger, multi-directional anchoring
• 6D cog threads — the most advanced cog configuration, with multiple rows and planes for maximum lift capacity and stability

Typical Uses. Brow, jawline, cheeks, midface and neck — the areas where sagging tissue needs to be physically repositioned.

Specifications to Know. Cog threads are thicker — typically 18G to 25G in 38 mm to 140 mm lengths. Gauge selection matters: thicker cogs give stronger lifts but require more skill and cause more temporary swelling.

Technique Note. Correct vector placement and anchoring are critical. Common errors — placing cogs too superficially (visible rippling) or with an incorrect vector (asymmetric lift) — are avoidable with training.

Browse the Cog Threads Collection, which includes 4D and 6D models.

Screw Threads

What Are Screw Threads? Screw threads have a twisted, spiral structure that increases the contact surface between thread and tissue, amplifying the collagen response while providing gentle structural support.

How Screw Threads Work. The spiral geometry does two things: it holds a small amount of volume in the tissue (a soft "filling" effect) and it maximizes the surface area for collagen stimulation. The result is subtle support plus meaningful skin improvement.

Typical Uses. Cheeks (volume support), nasolabial folds, under-eye area and areas needing gentle support without a strong lift.

Specifications to Know. Screw threads commonly range from 25G to 30G in 38 mm to 90 mm lengths.

How Screw Threads Differ from Mono. Mono threads only stimulate; screw threads add gentle structural support. For patients who need a little "lift in the tissue" without the strength of a cog, screw is the middle ground.

Browse the Screw Threads Collection for available sizes.

Multi Threads

What Are Multi Threads? Multi threads bundle several fine filaments into a single thread, increasing the total stimulation surface while keeping each filament delicate.

How Multi Threads Work. More filaments = more tissue contact = a stronger collagen response than a mono thread of similar gauge. The individual filaments remain fine, so the approach stays suitable for delicate skin.

Typical Uses. Skin rejuvenation where a stronger biological response is wanted without lifting — décolleté, face and neck skin quality work.

Browse the Multi Threads Collection for available options.

Molding Threads

What Are Molding Threads? Molding threads feature a 3D structured design that combines lifting and volume-restoring action in a single thread.

How Molding Threads Work. The three-dimensional geometry provides structural support that "molds" the tissue into a new position — stronger than screw threads, gentler in profile than heavy cogs — while stimulating collagen throughout the support period.

Typical Uses. Cheek volume and midface contouring, where both lift and a soft volume effect are desired.

Browse the Molding Threads Collection for available options.

Double Needle Threads

What Are Double Needle Threads? Double needle threads are supplied with two needles — one at each end of the filament.

How Double Needle Threads Work. The practitioner can anchor both ends of the thread independently, which improves placement control dramatically. This is particularly useful for procedures that require precise two-point anchoring.

Typical Uses. Brow lifts (where both ends of the thread can be positioned symmetrically) and nasolabial fold work (where the thread can be anchored above and below the fold).

Advantage. Greater control over the final vector than single-needle designs — the thread can be adjusted from both ends before final anchoring.

Browse the Double Needle Threads Collection for available sizes.

Fishbone Threads

What Are Fishbone Threads? Fishbone threads feature a distinctive fishbone-shaped barb design — a central spine with angled barbs along both sides.

How Fishbone Threads Work. The fishbone geometry distributes tension evenly along the thread, providing strong, stable lifting with good anchoring in both directions. The design is often selected for firmer lifting where stable, even tension matters.

Typical Uses. Areas needing firm, even lift with secure anchoring — midface and lower-face contouring.

Browse the Fishbone Threads Collection for available options.

Tornado Threads

What Are Tornado Threads? Tornado threads have a twisted, tornado-like spiral structure that maximizes tissue contact for collagen stimulation and structural support.

How Tornado Threads Work. The twisted geometry creates a large contact surface — similar to screw threads but with a tighter, more energetic twist — driving a strong biological response while offering subtle support.

Typical Uses. Rejuvenation protocols where maximum stimulation and gentle support are wanted in the same thread.

Browse the Tornado Threads Collection for available options.

Eye Threads

What Are Eye Threads? Eye threads are extra-fine threads designed specifically for the delicate periorbital area.

How Eye Threads Work. Their fine structure allows precise, gentle placement with minimal tissue trauma in an area where bruising and asymmetry are the greatest risks. They are used for subtle brow positioning and under-eye rejuvenation.

Typical Uses. Brow tail elevation, under-eye skin quality, crow's feet region.

Why Eye Threads Matter. The periorbital skin is the thinnest on the face. Using standard threads here invites visible rippling and prolonged bruising; dedicated eye threads are engineered for this anatomy.

Browse the Eye Threads Collection for available sizes.

Other Thread Designs

Beyond the core types, several specialized designs complete a full professional range:

• Twisted threads — twisted filament structure for enhanced collagen stimulation
• Double screw threads — dual-spiral design for increased volume support
• Cones — cone-shaped elements along the thread for strong point anchoring

Thread Type Quick Reference

Thread Type	Structure	Primary Action	Typical Uses	Typical Gauge
Mono	Smooth single filament	Collagen stimulation	Fine lines, skin quality	26G–30G
Cog	Barbed (incl. 3D/4D/6D)	Mechanical lifting	Brow, jawline, cheeks	18G–25G
Screw	Spiral	Volume support + stimulation	Cheeks, nasolabial, under-eye	25G–30G
Multi	Multiple filaments	Stronger stimulation	Delicate skin, rejuvenation	21G–23G
Molding	3D structure	Lift + volume	Midface, cheek contour	19G
Double Needle	Two-needle design	Precise anchoring	Brow, jawline, neck	19G–20G
Fishbone (Cones)	Cone-shaped barbs	Strong, even lift	Midface, lower face	18G–19G
Tornado	Twisted spiral	Stimulation + support	Rejuvenation	26G–27G
Eye	Extra fine	Gentle precision	Periorbital area	30G

Thread Applications by Area

Different facial areas place different demands on thread selection: skin thickness, mobility, vascular risk and aesthetic goal all change from the brow to the neck. This section walks through the primary treatment areas — key areas in depth, lower-volume areas in brief — with patient-selection notes, technique points and recommended protocols.

Brow

Why the Brow. The brow is one of the most popular thread lifting areas. A tired or heavy brow ages the entire upper face; a subtle elevation of the tail and arch opens the eyes and refreshes the expression.

Recommended Approach. Fine-gauge cog threads (e.g. 23G–25G designs) for lifting the brow tail, or mono threads for subtle elevation and skin quality. PDO is the standard material here. Auro's PDO Cog 4D and Mono threads are commonly selected.

Patient Selection. Best candidates have mild-to-moderate brow ptosis with good skin elasticity. Heavier brows or very lax skin respond less well and may be better served by surgery.

Technique Points. The temporal area is vascular — precise placement is essential to avoid vessels. Vectors should follow the natural brow line, and symmetry between sides is verified before anchoring. Over-correction produces an unnatural "surprised" look.

Results. Immediate subtle lift; progressive improvement over 4–8 weeks as collagen forms. Duration typically 6–12 months with PDO.

Learn more in our Threads for Brow guide, or browse the Cog Threads Collection.

Neck

Why the Neck. The neck is a high-demand, high-movement area where laxity and crepey skin are common concerns — and where shorter-lasting materials disappoint. The neck's constant movement means threads here need both strength and longevity.

Recommended Approach. PCL threads are the material of choice: their 18–24-month absorption supports neck tissue over an extended period. Screw and cog PCL threads address tightening; mono threads improve crepey skin texture. PDO is an alternative for lighter cases.

Patient Selection. Best candidates have mild-to-moderate neck laxity and adequate skin elasticity. Significant platysma banding or advanced laxity is better served by surgery or combined protocols.

Technique Points. The neck has a thinner skin envelope and important anatomy (platysma, vessels, nerves). Threads are placed in the appropriate plane with conservative vectors. Aftercare discipline — no heavy movement, correct sleep position — matters more here than anywhere else.

Results. Progressive tightening over weeks; duration typically 12–24 months with PCL.

Learn more in our Threads for Neck guide, or browse the PCL Threads Collection.

Jawline

Why the Jawline. The jawline is the signature area for cog thread lifting — the area where the difference between a defined and a softened jaw is most visible, and where patient satisfaction is highest when selection and technique are right.

Recommended Approach. Cog 4D and molding threads placed along the lower border redefine the jaw angle, reduce jowling and create the V-shape profile many patients request. PDO for the primary lift; PCL where longer support is wanted.

Patient Selection. Best candidates have mild-to-moderate jowling with good skin elasticity. The jawline responds well to threads in most face types — it is one of the most forgiving areas for thread lifting.

Technique Points. Multiple threads are usually placed in a fan pattern from a lower anchor point, each with a slightly different vector. Correct depth (avoiding the superficial plane) prevents rippling. Symmetry checks are essential before anchoring.

Results. Immediate visible definition; full effect at 4–8 weeks. Duration 6–12 months (PDO) to 18–24 months (PCL).

Learn more in our Threads for Jawline guide, or browse the Cog Threads Collection.

Cheeks

Why the Cheeks. The cheeks are the volume and projection center of the face. Threads here address both laxity and early volume loss — and the cheek is where PLLA and PCL materials shine.

Recommended Approach. Combination protocols: screw or PCL threads for volume support and collagen stimulation, cog threads for lift, and PLLA threads for progressive biostimulation and gradual volume restoration. A full cheek protocol often uses two thread types in one session.

Patient Selection. Candidates with early cheek descent or volume loss. Significant fat loss may be better treated with fillers — and many clinics combine threads with small-volume filler for the best result.

Technique Points. The cheek has a rich vascular network — deep placement and knowledge of the danger zones are essential. Vectors should lift toward the temple, and symmetry is verified before anchoring.

Results. Immediate subtle lift plus progressive volume and quality improvement; duration 6–24 months depending on material mix.

Learn more in our Threads for Cheeks guide, or browse the Screw Threads Collection.

Nasolabial Folds

Why the Nasolabial Folds. The nasolabial folds are a high-visibility concern. The area is highly mobile, which makes it technically demanding — and it responds best to support, not pull.

Recommended Approach. Screw and mini cog screw threads placed along the fold, which soften the crease by supporting the tissue beside it. A combination of screw threads (support) and mono threads (skin quality) gives the most balanced result. PDO is standard; PCL for longer support.

Patient Selection. Candidates with fold depth caused by tissue descent and laxity. Very deep static folds with significant volume loss may need filler support as well.

Technique Points. The fold is treated by placing threads parallel to it in the mid-dermis or subcutaneous plane. Over-aggressive correction can create an unnatural "pulled" look — conservative vectors give natural results.

Learn more in our Threads for Nasolabial Folds guide, or browse the Screw Threads Collection.

Nose

Why the Nose. A non-surgical nose lift refines the nasal tip and bridge without surgery — a niche but highly appreciated procedure.

Recommended Approach. Specialized nose threads (19G L-cannula designs in 38 mm and 60 mm) are placed to lift the tip and refine the bridge. Auro's PDO Nose Thread is designed for this application.

Patient Selection. Candidates with a drooping tip or mild bridge irregularity who want subtle refinement. Major reshaping is not achievable with threads.

Technique Points. The nose is a technique-sensitive area with thin skin and dense anatomy. Placement must follow dedicated nose-thread protocols; practitioners should complete specific training before offering nose lifting. This area is not for beginners.

Results. Subtle tip elevation, visible immediately; duration typically 6–12 months.

Browse the Nose Threads Collection, or learn more in our Threads for Nose guide.

Under-Eye

Ultra-fine 30G eye threads (W-cannula designs in 25 mm and 38 mm) provide gentle support and collagen stimulation with minimal trauma. They are the standard choice for the under-eye area; technique and patient selection are critical in this delicate, thin-skinned zone. Candidates with true fat herniation or significant hollows are better served by other approaches.

Browse the Eye Threads Collection for the appropriate sizes.

Forehead

The forehead is treated with fine mono threads to smooth fine lines and improve skin quality. Cog threads are avoided in the mid-forehead due to the risk of visible rippling; mono threads at 30G are the safe default. The brow area can be treated with fine cogs at the lateral edge only.

Browse the Mono Threads Collection for the appropriate sizes.

Midface

The midface benefits from PCL and PLLA threads for longer-lasting volume support and collagen stimulation, often combined with cog threads for lift. It is a priority area for combination protocols because midface descent drives both nasolabial folds and jowling.

Browse the PCL Threads Collection and PLLA Threads Collection for the appropriate materials.

Jowls

Jowls respond to cog and PCL threads placed along the lower face to reduce sagging at the jaw margin. PCL is often preferred for longer support in this high-movement area; combining with jawline threads creates a full lower-face protocol.

Browse the Cog Threads Collection and PCL Threads Collection for the appropriate options.

How to Choose the Right Thread

Choosing the right thread is a decision tree, not a single rule. Work through the five steps below in order, and the right choice becomes clear.

Choose by Treatment Goal

Start with what the procedure must achieve. This is the most important question, and it eliminates most of the catalogue immediately.

• For lifting → Cog threads (or molding threads for stronger support). Barbed and 3D designs provide the immediate mechanical lift.
• For collagen stimulation → Mono threads. Smooth filaments maximize the biological response with no mechanical lift.
• For volume support → Screw threads, or PLLA materials for gradual volume restoration.
• For skin quality and fine lines → Mono and multi threads.
• For a combination → The modern standard: a cog thread for lift plus a mono or screw thread for quality, staged in one protocol.

Example: A 45-year-old patient wants a visible jawline lift and better cheek skin. The answer is not one thread — it is PDO cog threads for the jawline plus mono threads for the cheeks.

Choose by Material

The material decides how long results last and how the tissue responds over time:

• PDO — fast visible lift, 6–12 months of effect, most cost-effective, best for first-time patients and all-around use.
• PCL — 18–24 months, sustained collagen stimulation, best for longer-lasting results with fewer sessions and high-movement areas.
• PLLA — 12–24 months, strong biostimulation, best for gradual skin improvement and volume restoration.

Rule of thumb: if the patient asks "how long will it last?" the answer starts with material. If they ask "how fast will I see it?" the answer starts with PDO.

Choose by Thread Type

Match the mechanical design to the tissue demand:

• Cog (incl. 4D/6D) — anchoring and strong lift
• Molding — lift plus volume contour
• Screw — support and stimulation
• Mono / Multi — stimulation only
• Eye — delicate periorbital work
• Fishbone / Tornado — specialized lift / stimulation profiles

See the quick-reference table in the Thread Types section for gauge ranges and typical uses.

Choose by Treatment Area

Area dictates gauge, length and design. Refer to the Thread Applications section for area-by-area recommendations — the brow and under-eye need fine, precise threads (30G); the nose uses dedicated 19G designs; the jawline and midface take stronger cog and molding designs (19G–25G); the neck benefits from PCL's longevity. Skin thickness, mobility and vascular risk all factor into the choice.

Medical vs Cosmetic Grade

For professional use, medical-grade threads are non-negotiable. Medical-grade products are manufactured under validated sterile conditions, meet applicable regulatory requirements, and carry the documentation clinics need — batch certificates, sterility assurance and, for EU markets, CE-Marking. Cosmetic-grade threads without certification should never be used clinically; the liability and patient-safety implications are significant.

When sourcing, verify:

1. CE-Marked (EU) or applicable regional registration
2. Validated sterile packaging with expiry dates
3. Batch documentation available per order
4. Consistent gauge and length tolerances
5. Manufacturer quality systems (ISO 13485 or equivalent)

Quick Decision Guide

Need	Material	Thread Type	Typical Gauge
Immediate lift	PDO	Cog 4D	19G–23G
Long-lasting lift	PCL	Cog	21G–25G
Collagen / skin quality	PDO / PLLA	Mono, Multi	21G–30G
Volume support	PCL / PLLA	Screw	25G–30G
Delicate areas	PDO	Eye, Mono	26G–30G
Combined protocol	PDO + PCL/PLLA	Cog + Mono/Screw	Mix

Browse our Thread Collections to compare available products, and see the FAQ for more on medical vs cosmetic grade.

Thread Comparison

Comparisons are how patients (and practitioners) actually decide. This section compares the three materials across every dimension that matters — and explains how to compare brands fairly.

PDO vs PCL vs PLLA at a Glance

Dimension	PDO	PCL	PLLA
Duration	6–12 months	18–24 months	12–24 months
Main function	Immediate lift + collagen	Long collagen stimulation	Strong biostimulation
Lifting power	Strong	Moderate-strong	Low
Skin-quality effect	Moderate	High	Highest
Time to full result	2–6 weeks	6–12 weeks	8–16 weeks
Recovery	24–48 h	24–48 h	24–48 h
Best applications	Lifting, all areas, entry level	Long-lasting lift, neck, midface, jowls	Skin quality, gradual volume, long-term
Typical price	Entry	Mid	Premium

PDO vs PCL: Which Lasts Longer?

The most common question from patients is longevity — and the answer is unambiguous: PCL lasts roughly twice as long as PDO. PDO absorbs in 6–8 months with an effect of 6–12 months; PCL absorbs over 18–24 months with an effect of up to 24 months.

The real question is which is *right* for the patient, not which is "better":

• Choose PDO when — the patient wants a visible lift soon, is cost-sensitive, is trying threads for the first time, or is likely to want adjustments over time.
• Choose PCL when — the patient wants a single procedure with minimal maintenance, is treating the neck or another high-movement area, or wants sustained collagen stimulation.

PDO vs PLLA: Lifting vs Collagen

PDO and PLLA sit at opposite ends of the mechanism spectrum:

• PDO — mechanical lifting you can see immediately; short-to-mid duration; strong entry-level profile.
• PLLA — collagen stimulation that builds gradually over months; no significant lift; the strongest biostimulator of the three.

Patients who want a quick, visible change choose PDO. Patients who prioritize natural, long-term skin improvement choose PLLA. The two are complementary, and many protocols use PDO cogs for the immediate lift with PLLA threads for sustained collagen — the combination is often more satisfying than either alone.

PCL vs PLLA: Longevity vs Biostimulation

Both PCL and PLLA are long-lasting, but they differ in character:

• PCL — stronger structural presence, longer-lasting support, lifting-friendly. The choice when the goal is durable structure.
• PLLA — the more potent collagen biostimulator, preferred for skin quality and gradual volume work. The choice when the goal is tissue quality.

Experienced practitioners often select PCL for structure and PLLA for skin — sometimes in the same treatment plan, with PCL threads supporting while PLLA builds collagen underneath.

Auro Threads vs Other Brands

When comparing brands, compare parameters, not marketing claims. The dimensions that actually matter:

Parameter	Why It Matters
Material and absorption profile	Determines duration and collagen response
Gauge range and consistency	Determines what areas the range can cover
Barb/cog design quality	Determines anchoring strength and lift quality
Sterility and packaging	Patient safety and regulatory compliance
Certification (CE-Marked, regional)	Legal and professional requirements
Batch documentation	Traceability and clinic liability

Auro Threads are manufactured to medical-grade standards, are CE-Marked, and offer a complete range across PDO, PCL and PLLA in mono, cog, screw, molding, multi, double needle, fishbone, tornado and eye designs, with full batch documentation for clinics. See our PDO vs PCL vs PLLA Threads comparison and the Auro vs Aptos comparison for brand-level detail.

Results, Longevity and Aftercare

Managing expectations is half of a successful thread procedure. This section gives practitioners the exact timelines to communicate to patients — and the aftercare protocols that protect results.

What Results to Expect and When

Thread lifting produces results on three timelines:

Phase	Timeline	What the Patient Sees
Immediate	Day 0–14	Lifting visible right away; mild swelling, bruising and tenderness normal; settles within 1–2 weeks
Progressive	Weeks 1–3	Collagen stimulation builds; skin looks firmer; small irregularities settle
Final	Months 1–3	Full effect established — lift plus tissue quality; skin feels thicker and firmer

Important expectation-setting: the immediate post-procedure view is *not* the final result. Swelling masks the true outcome for 1–2 weeks, and the collagen effect continues for months. Patients should be told to judge the result at 4–8 weeks, not at day 2.

How Long Do Threads Last?

Duration depends mainly on material:

• PDO — effect typically 6–12 months; maintenance touch-up usually once a year
• PCL — effect typically 18–24 months; maintenance every 18–24 months
• PLLA — effect typically 12–24 months; results peak later and fade more gradually

Duration also depends on the area treated (high-movement areas like the neck shorten effect), thread gauge, and the individual's tissue response and collagen metabolism.

Recovery: What Patients Experience

• Day 0–2: mild swelling, possible bruising, tenderness at entry points; normal activities resume within 24–48 hours
• Day 3–7: swelling largely resolves; bruising fades; slight skin irregularity possible as tissue adapts
• Week 1–2: most patients look "back to normal" — the visible lift is the main change
• Week 4–8: collagen effect becomes apparent; final assessment point

Aftercare: The Complete Do and Don't List

Do:

• Sleep on the back with the head elevated for the first 3 nights
• Apply cold compresses in the first 24–48 hours to reduce swelling
• Keep the entry points clean and dry as directed
• Follow the practitioner's specific protocol precisely
• Return for the scheduled review at 2–4 weeks

Don't:

• Do not exercise vigorously or bend over for the first 1–2 weeks
• Do not massage, rub or manipulate the treated area (this can displace threads)
• Do not have facial treatments (facials, peeling, laser) for 2 weeks
• Do not undergo dental work for 2 weeks (jaw movement displaces lower-face threads)
• Do not sleep face-down for the first 1–2 weeks
• Do not pull at the skin or inspect the threads

Practitioner note: give the aftercare card to every patient. Most thread complications that are avoidable come from aftercare violations in the first two weeks.

See our Thread Longevity and Results Timeline guide for more detail, and the FAQ for aftercare questions.

Safety, Candidacy and Contraindications

Safety in thread lifting is a triangle: certified product, trained practitioner, correct patient. This section covers the patient-selection side of that triangle in full.

Is Thread Lifting Safe?

When performed by a trained, licensed practitioner using CE-Marked, medical-grade threads, thread lifting is a well-established procedure with a favorable safety profile. It has been performed internationally for over two decades, and the absorbable materials involved have surgical histories spanning decades more.

Safety rests on three independent factors:

1. Product quality — certified medical-grade threads with validated sterility and documentation
2. Practitioner skill — anatomy knowledge, correct plane placement, vector control
3. Patient selection — candidacy screening and contraindication review before every procedure

Failures in any one of the three increase risk disproportionately. A certified product cannot compensate for poor technique; a skilled practitioner cannot make an unsuitable patient a good candidate.

Who Is a Good Candidate?

Good candidates are adults with mild-to-moderate skin laxity who want a non-surgical lift, have realistic expectations, and are in good general health. The procedure is most popular with patients aged 30–55 who want early intervention or a bridge between injectables and surgery.

Signs of a good candidate:

• Mild-to-moderate brow, cheek or jawline laxity
• Good skin elasticity (the "snap-back" test)
• Realistic expectations about lift strength and duration
• Understanding of the maintenance requirement (material-dependent)
• Willingness to follow aftercare

Signs of a borderline or poor candidate:

• Advanced skin laxity (threads will visibly under-deliver)
• Very thin or very thick skin without appropriate thread adjustment
• Unrealistic expectations ("I want a facelift result")
• History of poor scarring or keloid formation (relative caution)
• Significant volume loss without filler support

Contraindications

Thread lifting should not be performed on patients with:

Contraindication	Rationale
Active skin infection or inflammation in the treatment area	Risk of spreading infection
Known allergy or sensitivity to the thread material	Allergic response risk
Bleeding disorders or anticoagulant therapy (unless cleared by physician)	Hematoma risk
Autoimmune disease or uncontrolled systemic illness	Impaired healing and response
Pregnancy or breastfeeding	Not studied in these populations
Psychiatric conditions affecting expectations	Poor consent validity
Previous surgery or implants in the treatment area (relative)	Anatomical unpredictability

Practitioners are responsible for a full medical history, medication review (including NSAIDs and supplements that affect clotting) and informed consent before any thread procedure.

Side Effects and Complications

Common and self-limiting (most patients experience some):

• Mild swelling — resolves within 5–14 days
• Bruising — fades within 1–2 weeks
• Tenderness and soreness — resolves within days
• Temporary skin irregularity — settles as tissue adapts
• Slight asymmetry during the settling phase — typically resolves

Rare complications (minimized by correct selection, certified products and technique):

• Thread migration or extrusion
• Visible rippling (usually from too-superficial placement)
• Infection at entry points
• Nerve irritation (usually transient)
• Prolonged bruising or hematoma

Complication management principle: early recognition and referral. Practitioners should document, review at scheduled intervals, and escalate unusual presentations promptly.

See the FAQ for candidacy and safety questions, and our Complications and Risks guide for detailed management guidance.

Frequently Asked Questions

Material Basics

What are PDO threads?

PDO (polydioxanone) threads are absorbable threads used for non-surgical lifting and collagen stimulation. They absorb in 6-8 months with an effect lasting 6-12 months.

What are Cog threads used for?

Cog threads lift and anchor sagging tissue — brow, jawline, cheeks and midface — with immediate visible results.

What are screw threads used for?

Screw threads provide volume support and collagen stimulation for the cheeks, nasolabial folds and under-eye area.

What is the difference between mono and cog threads?

• Mono threads: collagen stimulation and skin quality, no lifting
• Cog threads: mechanical lifting with barbs

They are different tools for different goals.

Medical vs cosmetic grade — what is the difference?

Medical-grade threads are sterile, certified and documented for clinical use; cosmetic-grade products are not appropriate for procedures.

Results and Longevity

How long do aesthetic threads last?

• PDO: 6-12 months
• PCL: 18-24 months
• PLLA: 12-24 months

Duration also depends on the area and the individual.

When will I see results from thread lifting?

The lift is visible immediately; the collagen effect builds over 4-12 weeks; the final result is assessed at 4-8 weeks.

How do threads stimulate collagen?

The absorbable material triggers a controlled tissue response that stimulates collagen and elastin production over 4-12 weeks.

How often do I need maintenance?

Typically once a year for PDO, every 18-24 months for PCL and PLLA — depending on the treatment plan.

Procedure and Recovery

Do thread lifts hurt?

Discomfort is minimal; local anaesthetic and fine needles make the procedure well tolerated. Mild soreness resolves within days.

How long is recovery time?

Most patients resume normal activities within 24-48 hours; swelling and bruising settle within 1-2 weeks. Full results are assessed at 4-8 weeks.

How long does swelling last after threads?

Most swelling resolves within 5-14 days; bruising typically fades within 1-2 weeks.

Are threads visible under the skin?

No — absorbable threads are placed beneath the skin and are not visible. Fine entry points heal without noticeable marks.

Candidacy and Safety

Who is a good candidate?

Adults with mild-to-moderate laxity who want a non-surgical lift with realistic expectations, in good general health.

Are thread lifts safe?

Yes, when performed by licensed practitioners using CE-Marked medical-grade threads with correct patient selection and technique.

Do threads work for everyone?

No — candidacy depends on skin laxity, elasticity and expectations. Patients with advanced laxity are better served by surgery.

Comparison and Selection

Which thread is best for lifting?

Cog threads (including 4D/6D designs) provide the strongest mechanical lifting; molding threads add 3D support. PDO is the standard lifting material.

What is the difference between PDO and PCL threads?

PDO provides a faster, shorter-lasting lift (6-12 months); PCL lasts longer (18-24 months) with sustained collagen stimulation. PCL is the choice for fewer repeat sessions.

Cost and Combinations

Can threads be combined with other procedures?

Yes — threads are frequently combined with injectables and skin treatments in staged protocols; timing depends on the practitioner's plan.

How much does thread lifting cost?

Pricing varies by area, thread count, material and region; consult the clinic for an accurate quote. Material choice (PDO vs PCL vs PLLA) is a major cost factor.

For more, visit our complete Thread Lifting FAQ.

For Clinics and Distributors

Auro Technology supplies professional-grade PDO, PCL and PLLA threads with CE-Marked certification, full batch documentation and a complete range of thread designs — mono, cog (including 4D/6D), screw, molding, multi, double needle, fishbone, tornado and eye. Clinics and distributors can purchase wholesale, OEM and private-label options with factory-direct pricing, sample orders and MOQ flexibility.

• Wholesale Threads
• OEM and Private Label
• Contact Our Team

Disclaimer

This page is for educational and informational purposes for licensed practitioners. Thread lifting is a professional aesthetic procedure that should only be performed by qualified, licensed practitioners. Auro Technology products are CE-Marked medical devices for professional use. Individual results vary; nothing on this page constitutes medical advice, a diagnosis, or a guarantee of outcome.