PDO threads cover a category of treatment that is often described in promotional language but rarely explained clinically. The two main types, mono threads and lifting threads, do quite different things. Confusing them is one of the more common reasons patients have unrealistic expectations of either.
I am Shontelle, the registered nurse at Silk Clinical Aesthetics. This article explains what each thread type is, what it can and cannot do, and where threads fit alongside the other tools we use for skin laxity and structural change.
What PDO is
PDO stands for polydioxanone, a biocompatible material used in medical sutures for decades. PDO threads are made from the same material, in fine filament form, and are designed to be placed under the skin where they perform two jobs: a mechanical effect from the thread itself, and a stimulatory effect on the surrounding tissue as the body reacts to the foreign material before fully absorbing it over four to six months.
The thread is reabsorbed by the body. The tissue response and collagen stimulation it triggers persists longer than the thread itself, which is the basis for the lasting effect.
That is the common ground. The two main thread types diverge from there.
Mono Threads
Mono threads are smooth, fine, single filaments. Multiple threads (often 20 to 50 per area) are placed in a fan or grid pattern under the skin in the dermal layer.
Mono threads do not lift tissue. They are not designed to. Their primary mechanism is collagen stimulation: the body's response to the foreign filaments produces new collagen and elastin in the surrounding tissue over the months that the threads are present and the months following.
What mono threads are good for:
- Improving skin quality and firmness over a treatment area.
- Softening fine lines and crepey texture.
- Adding tissue density in areas where the skin has thinned.
- Treating areas that are not appropriate for energy-based skin tightening (such as some periorbital and decolletage areas).
What mono threads are not good for:
- Lifting sagging tissue.
- Repositioning the jowl, brow, or midface.
- Producing a visible structural change immediately after treatment.
If a clinic is selling mono threads as a "non-surgical facelift", that is misleading. Mono threads improve skin quality. They do not lift.
Lifting Threads (Cog or Barbed Threads)
Lifting threads are different in design and intent. They are heavier filaments with bidirectional barbs, cogs, or molded protrusions along their length. The barbs grip the tissue at multiple points, allowing the thread to pull and reposition tissue when it is anchored at one end.
Lifting threads do produce a mechanical lift. They are placed through the deeper subcutaneous tissue, anchored to a fixed point (usually in the temple or behind the hairline), and tensioned to lift the tissue along the path of the thread. The number of threads per area is much smaller than mono threads (often 4 to 8 per side of the face).
The lift achieved is real but modest, and not equivalent to a surgical facelift.
What lifting threads are good for:
- Modest repositioning of the jowl and lower face.
- Refinement of the jawline contour.
- Subtle lifting of the midface and cheek.
- Patients who want a structural change but are not yet candidates for, or interested in, surgical lifting.
What lifting threads are not good for:
- Significant jowling or established laxity. The mechanical capacity of the threads is limited.
- Substituting for the result of a surgical facelift in a patient who actually needs one.
- Areas where the underlying tissue is too thin to anchor the threads safely.
How they Compare on Recovery, Duration, and Cost
Recovery: Mono threads have minimal downtime. Some pinpoint bruising and tenderness for a few days. Lifting threads are more invasive, with more notable bruising, swelling, and tenderness, often for one to two weeks. Patients often notice the threads under the skin for several weeks until the tissue settles around them.
Duration: Mono thread results, once collagen stimulation is complete, typically last 12 to 18 months. Lifting thread results last 12 to 18 months as well, though the experience is different: the immediate mechanical lift softens over the first few months, and the longer-term result is supported by the collagen stimulation that the threads also trigger.
Cost: Mono threads are usually charged per thread or per area, with a typical face treatment landing in the $600 to $1,200 range depending on coverage. Lifting threads are charged per thread, with a typical jawline or jowl treatment landing in the $1,500 to $3,000 range depending on the number of threads required.
Where Threads Fit Alongside Other Tools
Threads are not the only answer to skin laxity and they are rarely the best single answer. The realistic comparison is with energy-based treatments and with filler.
Volnewmer (RF skin tightening) uses controlled radiofrequency heating in the deep dermis to stimulate collagen remodelling. The mechanism overlaps with what mono threads achieve, but with no foreign material left in the body and a different distribution of energy. For overall skin laxity and quality across a broad area, Volnewmer is often the first choice. For more on the technology, see the Volnewmer guide.
Ultraformer MPT (HIFU) uses focused ultrasound to target the SMAS layer beneath the skin, producing a non-surgical lift. The mechanism is closer to what lifting threads attempt, but at a deeper structural plane and without inserted material. For genuine non-surgical lifting in a candidate who does not want surgery, Ultraformer MPT is often a stronger choice than lifting threads, particularly when paired with RF skin tightening.
Filler addresses volume rather than laxity, but in many cases the apparent sagging is partly due to volume loss in the midface or cheek. Restoring that volume can soften the appearance of jowling without any thread or energy treatment, particularly in younger patients in their thirties and forties.
In practice, a considered plan for laxity often combines two or three of these tools rather than relying on any one. Threads, when used, sit alongside the others rather than replacing them.
When Threads Are the Right Answer
Mono threads are a reasonable choice when:
- You want to improve skin quality and density in an area where energy-based treatment is not the best fit.
- You have already had energy-based skin tightening and want to layer in additional collagen stimulation.
- You have specific areas (such as around the mouth or on the decolletage) where the geometry of mono threads suits the concern.
Lifting threads are a reasonable choice when:
- You have early to moderate laxity that is not severe enough for surgical referral but does not respond fully to energy-based lifting alone.
- You are not interested in or not a candidate for HIFU.
- You have realistic expectations of a modest, time-limited result rather than a surgical-grade outcome.
When threads are not the right answer, we will say so. The most common reason we decline thread treatment is that the patient's concern is better addressed by another tool, or that the laxity is significant enough to warrant a surgical referral rather than non-surgical lifting.
Risks and Considerations
Threads are well tolerated in most patients but carry specific risks worth understanding.
Bruising and swelling. Common with both types, more pronounced with lifting threads.
Asymmetry. Particularly with lifting threads, the mechanical placement and tension are operator-dependent. A skilled, experienced practitioner reduces but does not eliminate the risk.
Visible or palpable thread. Threads occasionally become visible at the surface or palpable through thin skin. This is more common in patients with thinner tissue and can usually be addressed with adjustment or removal.
Thread migration. Rare but possible, particularly with lifting threads.
Infection. Rare with sterile technique but always possible whenever the skin is breached. Antibiotic protocols are sometimes used at higher-risk insertion points.
Discomfort during the maturation period. Mild tenderness is normal for several days; persistent pain warrants a review.
For an overview of how we sequence non-surgical skin tightening options, see Skin Tightening After 40 and HIFU vs Surgical Facelift.
How Silk Approaches Threads
Threads are part of our toolkit, not the centrepiece. We use them where they are clinically appropriate and we recommend other tools where those are a better fit. We do not present threads as a non-surgical facelift, because they are not.
Our most common use of mono threads is as part of a broader skin quality plan, often layered alongside Volnewmer or as a complement to skin booster treatments. Our most common use of lifting threads is for early, moderate laxity in patients who are not candidates for or not interested in surgical referral, and where Ultraformer MPT alone has not produced enough lift.
We will say no to threads in patients who are not appropriate candidates, including those with significant established laxity that needs surgical referral, those with very thin or compromised skin, and those whose concerns are better addressed by volume restoration or energy-based treatment.
Frequently Asked Questions
Are PDO threads safe?
PDO is biocompatible and has decades of use in surgical sutures. The risks of thread treatment are operator-dependent and tissue-dependent rather than material-dependent. Choosing a practitioner with specific experience in threads is the most important factor in safety.
How soon after treatment will I see the result?
Lifting threads produce an immediate mechanical change visible the same day, although swelling can mask it for the first week. The longer-term collagen-stimulated result builds over three months. Mono threads do not produce an immediate visible change. The result builds over two to three months as collagen response progresses.
Can threads be removed if I am unhappy?
Yes, lifting threads in particular can be removed in the first weeks after placement if there is a clear problem. After several weeks, the tissue has begun to integrate the thread and removal becomes more involved. Mono threads are smaller and not typically removed.
How long should I wait between thread treatments?
Most patients are appropriate to repeat thread treatment after 12 to 18 months. Treating earlier than that does not usually add benefit and can increase the risk of foreign body reactions. The decision to retreat is made on visible result rather than calendar time.
Can I have threads and other treatments together?
Yes, and that is often the right plan. Threads pair well with energy-based skin tightening, with skin boosters, and with conservative filler. The order of treatments is decided in consultation; usually any active treatment in the same area is spaced by a few weeks.
What is the difference between PDO threads and PCL or PLLA threads?
PCL (polycaprolactone) and PLLA (poly-L-lactic acid) are alternative absorbable thread materials with longer absorption profiles than PDO. Some practitioners prefer them for lifting threads in particular. The clinical evidence base for PDO is the largest, but PCL and PLLA threads are reasonable alternatives in the right hands. The decision is often a function of practitioner experience and patient anatomy rather than a clear winner between the materials.
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