What are the differences between the various types of thread lift threads (PDO, PLLA, collagen, and cog threads)?

Quick Summary: Lifting threads differ across two independent axes. The first axis is structure: mono threads are smooth without barbs and are used solely for localized collagen stimulation; cog threads feature barbs that anchor into the tissue to generate mechanical lifting force. The second axis is material: PDO absorbs faster, while PLLA and PCL absorb more slowly and focus on prolonged collagen stimulation. The appropriate thread type is selected by the physician after palpating the tissue and assessing skin elasticity—it cannot be chosen merely through a comparison chart.

Why Are There So Many Types of Lifting Threads?

Because a "thread lift" actually combines two distinct mechanisms under a single name: mechanical lifting and stimulating the body's natural collagen production. A thread can focus on the former, specialize in the latter, or provide a moderate combination of both.

Therefore, asking "which thread is better?" is the wrong question. The right question is: does my concern require mechanical lifting or skin thickening/rejuvenation?—and that can only be answered after an in-person clinical examination.

Axis 1 — What Is the Difference Between Mono and Cog Threads?

"Thread extrusion through the skin" is one of the warning signs requiring immediate physician notification according to the BonBoz Clinic Post-Procedure Care Guide—and this is a risk specifically associated with cog threads, not mono threads.

Axis 2 — How Do the Materials Differ?

Note on reading this chart: slower absorption does not mean strictly better. Materials that absorb more slowly maintain their effect longer but also remain in the body for a greater duration—this is a clinical trade-off the physician evaluates for each individual, not a linear grading scale.

Regarding "Collagen Threads": This is a commercial marketing term highlighting the collagen-stimulating mechanism, not a distinct fourth material. When presented with this name, ask directly: what is the actual material, and is it a mono or cog thread?

Who Decides Which Thread Type to Use?

The physician, following a clinical examination. Four factors determine this selection, none of which can be fully evaluated from a photograph alone:

1. 1Degree of laxity—mild, moderate, or significant skin excess
2. 2Skin elasticity—assessed by the physician through palpation and pinch testing
3. 3Tissue thickness at the target site—thin tissue carries a higher risk of cog thread visibility or palpability
4. 4Your aesthetic goal—visible structural lifting, or simply a thicker and smoother skin foundation

You have the right and are encouraged to ask: which thread type and material are being used for your treatment, whether they have verifiable authenticity documentation, and why that specific option was selected over others.

Post-Thread Placement Care: Universal Protocol for All Types

According to the BonBoz Clinic Post-Procedure Care Guide for bio-absorbable thread lifts:

• Avoid water contact for the first 4 hours; cleanse the treated area gently with sterile saline solution
• Sleep in a supine position (on your back) with the head elevated for 1 week
• Apply prescribed topical antibiotic to insertion points for the first 3 days as directed
• Apply cold compresses for the first 2 days; warm compresses may be used starting from day 3
• Wear a facial compression/support garment continuously for week 1; wear 10–12 hours/day for weeks 2–4
• Do not massage or apply strong mechanical pressure to the treated areas
• Mild tightness, swelling, and slight tenderness are normal and will gradually subside within 1–4 weeks

Follow-up visit at 1–2 weeks to evaluate initial results, followed by periodic reviews at 1, 3, and 6 months.

Contact your physician immediately if you experience: abnormal severe swelling or purulent discharge · fever above 38.5°C · severe redness and pain that does not subside after 3 days · thread extrusion through the skin. Hotline: 0869 612 310 – 1900 5309.

Frequently Asked Questions

Are cog threads better than mono threads?

They cannot be compared directly as they serve two distinct purposes. Cog threads provide mechanical lifting, while mono threads improve skin quality and dermal thickness. Which one you need depends on your clinical assessment.

Between PDO, PLLA, and PCL, which lasts the longest?

PCL has the slowest absorption rate and generally provides the longest-lasting results, followed by PLLA, and then PDO. However, slower degradation also means the material stays in the body longer—a clinical trade-off rather than a measure of quality.

What material is a "collagen thread"?

It is a commercial term emphasizing the collagen-stimulating effect, not a separate material category. If this term is used, ask specifically whether the base material is PDO, PLLA, or PCL, and whether the design is mono or cog.

Can different types of threads be combined in a single session?

Yes, and this is standard clinical practice—for example, utilizing cog threads to reposition sagging tissue in areas requiring mechanical support, alongside mono threads to thicken the skin matrix in surrounding zones. This approach is customized by your physician based on the specific anatomical needs of your face.

Content compiled and clinically reviewed by the medical team at BonBoz Clinic.