If PDO threads dissolve in six months, why does the result last longer?
Medically reviewed by
The LovMedSpa medical team, led by Dr. Ahmed Elsoury, MD and Mark Ennett, PhD, CRNA
Last reviewed: July 2026
Polydioxanone hydrolyzes and is gone in roughly six months, yet the result frequently outlasts it. The support you keep after that point comes from collagen and fibrous tissue deposited along the thread tract, not from the thread itself.
One thread, two mechanisms on two timelines
Polydioxanone is a synthetic absorbable material long used in surgical suture. In the skin it breaks down by hydrolysis, largely complete within about six months. Patients reasonably ask why the result does not vanish on that schedule.
It does not, because the thread does two things on two timelines. The mechanical lift is immediate and comes from the cogs holding repositioned tissue. Simultaneously, the body responds to the thread as a foreign body with a controlled inflammatory response, laying down type I collagen and a fibrous sheath along the tract. As the polydioxanone resorbs, that deposited tissue remains and provides residual support along with improved skin quality.
What the first two weeks feel like — and what warrants a call
What this feels like from the inside is worth describing, because patients are rarely told. Tightness and mild tenderness along the tract in the first two weeks are expected. Cogs may be intermittently palpable in thin-skinned areas during the same period. Discomfort at the anchor point when opening the mouth widely usually settles within days. What is not expected is a visible band, a persistent dimple after two weeks, or spreading redness, and each of those warrants a call rather than patience.
How results fade, when to reassess, and why a second treatment differs
The practical consequence of the two timelines is that results decay on a curve rather than falling off a cliff. Most patients see the peak at two to three weeks once swelling resolves, hold well through months three to six, and notice gradual softening after that. Reassessment at six months is more useful than reassessment at three, because the collagen contribution is still developing at the earlier mark.
A second treatment behaves differently from the first, since it is placed into partially remodeled tissue. It also explains why repeated threading on a poor foundation compounds badly. Stacking fibrous tissue into a face that needed volume or surgical support produces a firmer result, not a better one. Threads work best planned as part of a sequence.
Common questions
What does recovery feel like in the first two weeks?
Tightness and mild tenderness along the thread tract are expected in the first two weeks, and cogs may be intermittently palpable in thin-skinned areas during the same period. Discomfort at the anchor point when opening the mouth widely usually settles within days. What is not expected is a visible band, a persistent dimple after two weeks, or spreading redness — each of those warrants a call rather than patience.
When do results peak, and when should I reassess?
Most patients see the peak at two to three weeks once swelling resolves, hold well through months three to six, and notice gradual softening after that — results decay on a curve rather than falling off a cliff. Reassessment at six months is more useful than reassessment at three, because the collagen contribution is still developing at the earlier mark.
How is a second thread treatment different from the first?
A second treatment behaves differently from the first because it is placed into partially remodeled tissue. Repeated threading on a poor foundation compounds badly — stacking fibrous tissue into a face that needed volume or surgical support produces a firmer result, not a better one. Threads work best planned as part of a sequence.
At LovMedSpa, PDO thread treatments are performed under the oversight of medical director Dr. Ahmed Elsoury, MD (New York and Connecticut) and Mark Ennett, PhD, CRNA (South Florida), available across our Brooklyn, Manhattan, Staten Island, Aventura, and West Farms locations. A consultation is the best way to determine whether threads, volume restoration, or a planned sequence of both is right for your goals.
This is general information, not medical advice; candidacy and treatment planning are determined by a licensed provider at consultation.