The honest answer depends on understanding how PDO threads work, and why the results unfold in two distinct phases. It depends on your age, your skin quality, your lifestyle, and the expertise of the person inserting the threads. This is not a procedure where one number fits every patient, and any provider who tells you otherwise is not giving you medical advice.

With more than 2,000 PDO thread patients treated across her clinics in Nottingham, Birmingham and Leeds, Dr. Aguilar has built a clear clinical picture of what drives long-lasting results and what shortens them. This article sets out exactly what the evidence says, what to expect at each stage of the process, and what you can do to get the most from your treatment.

What PDO threads actually do

Polydioxanone (PDO) is a synthetic absorbable polymer with a long history in surgical suturing. In aesthetic medicine, fine PDO threads are implanted into the subcutaneous layer of the skin, where they create two distinct effects.

The first is mechanical: barbed or smooth threads physically reposition soft tissue, producing an immediate visible lift. The second is biological: the presence of a foreign body triggers a wound-healing cascade, stimulating fibroblasts to produce new collagen and elastin through a process called neocollagenesis.^[1]

These two effects have very different lifespans, which is the source of almost all the confusion around how long PDO threads last.

Phase 1: The mechanical lift

This is what you see walking out of the clinic. The threads are physically holding tissue in a repositioned state. This effect begins to relax as the threads are absorbed. PDO threads are fully reabsorbed by the body via hydrolysis within approximately four to six months.^[2] Once the thread is gone, the mechanical tension it provided is gone with it.

This is why patients who assess their results at the six-month mark often feel underwhelmed. They are comparing a freshly-lifted face to one where the scaffolding has just dissolved.

Phase 2: The collagen response

The more durable effect comes from the body's response to the thread. As fibroblasts lay down new collagen around and along the dissolved thread tract, the dermis becomes thicker, firmer, and better supported. This process peaks at around six months and provides the structural basis for results that continue well beyond the life of the thread.^[3]

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What the clinical evidence says

The clinical consensus places visible results at 12 to 18 months for most patients, with some studies reporting maintenance of effect up to 24 months in optimal candidates.^[4] A 2023 study in Plastic and Reconstructive Surgery found that 85% of patients retained visible lifting effects beyond one year, with collagen stimulation peaking at the six-month mark.^[3]

A 2025 randomised controlled trial published in Aesthetic Surgery Journal Open Forum found that the number of PDO threads inserted did not significantly influence sustained lifting outcomes. The authors concluded that more threads do not automatically produce longer-lasting results, and that collagen stimulation is the primary driver of durable outcome.^[2]

Claims of two to four years are generally associated with combined protocols using PLLA or PCL threads, which have different degradation profiles and are not the same product as PDO.^[5] For PDO threads specifically, six to eighteen months is the honest clinical range.

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The thread lift timeline: what to expect month by month

Why your results may differ from someone else's

The 12 to 18 month figure is a population average. Individual results vary considerably, and not randomly. These factors have a documented influence on outcome.

Age and collagen baseline

Younger patients have greater residual collagen production capacity. The thread's biostimulatory signal lands in better-prepared tissue and the response is more robust.

Skin laxity and thickness

Mild to moderate laxity responds best. Patients with significant skin excess are not suitable candidates. The mechanical lift cannot compensate for what only surgery can address.

Smoking and sun exposure

Smoking directly impairs fibroblast function and collagen synthesis. Chronic UV exposure degrades new collagen. Both significantly shorten the effective duration of results.^[6]

Practitioner experience

Thread placement depth, vector of insertion, and anchoring technique materially affect how long the mechanical lift holds. This is not a procedure to delegate to an inexperienced provider.

Skincare maintenance

Medical-grade skincare supporting collagen synthesis, including retinoids, growth factors, and daily SPF, can meaningfully prolong the biological effects of the procedure.

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Dr. Aguilar's approach to maintenance

"I usually recommend repeating the treatment at around 10 to 12 months," says Dr. Aguilar. "At that point the collagen stimulus is still present in the tissue and a repeat procedure builds on what is already there, improving the lift each time rather than just restoring it. If we wait until 12 to 18 months the effect has faded completely and we are essentially starting from zero."

The majority of Dr. Aguilar's thread patients now treat once a year as a routine. New areas can be added at each appointment, treatment can be brought forward ahead of a special event, and there is no risk of looking overdone. Unlike fillers, threads add no volume and carry no risk of an artificial appearance. Every session actively improves the skin quality, not just the lift.

Are PDO threads worth it if results only last a year?

This is a reasonable question and deserves a direct answer. The value proposition of a thread lift is not equivalent longevity to surgery at a lower price. It is a clinically meaningful improvement in facial contour and skin quality, achievable without general anaesthesia, surgical risk, or weeks of recovery.

For a patient in their late thirties or forties experiencing early jowling and mid-face descent who is not ready or not suitable for surgery, a thread lift performed by an experienced medical practitioner is a clinically sound, well-evidenced option. Treated annually and correctly, results compound over time rather than simply repeat.

What to ask before booking a thread lift

Given the volume of non-medically qualified practitioners now offering thread lifting in the UK, the following questions are worth putting to any provider before proceeding.

Is this practitioner GMC registered, with documented training in advanced thread techniques and complication management? Do they use FDA or MHRA-cleared PDO threads from established suppliers? Are they prepared to give you a realistic duration range based on a physical examination of your skin? Do they have a protocol for managing complications, and are they qualified to do so?

Thread lifting is a safe procedure in the right hands, with a minor complication rate below 5% for smooth thread insertion.^[1] That figure rises with inexperienced placement, suboptimal patient selection, and the use of lower-grade materials.

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References

1. PMC / Aesthetic Surgery Journal (2025). Safety profile of PDO threads: complication rates by thread type. Smooth thread complication rate under 5%.

   
   

2. Aesthetic Surgery Journal Open Forum, Oxford Academic (January 2025). "Is More Always Better? A Randomised Comparative Clinical Trial About the Impact of PDO Thread Quantity for Facial Lifting." PMID: 40236886.

   
   

3. Plastic and Reconstructive Surgery (2023). Collagen stimulation in PDO thread lift patients: 85% retained visible lifting at 12 months; peak collagen stimulation at 6 months.

   
   

4. Journal of Cosmetic Dermatology (2024). Long-term data on PDO thread results: sustained benefits in most patients for 12 to 24 months.

   
   

5. Parfaire Medical Aesthetics (2024). Comparison of PDO, PLLA, and PCL thread longevity profiles.

   
   

6. Journal of Cosmetic Dermatology (2025). Results last longer in patients with healthy lifestyle habits and regular skin maintenance.