PDO threads dissolve in about 6 months, but the visible results typically last 12 to 18 months. That gap exists because the threads aren’t the only thing doing the work. As they dissolve, they trigger your skin to build new collagen and elastin, which continues to provide structure and firmness well after the threads themselves are gone.
How PDO Threads Break Down
PDO (polydioxanone) is a biodegradable material that your body absorbs through a process called hydrolysis, meaning water molecules gradually break the threads apart. The softer, less structured portions of the thread degrade first, while the denser crystalline portions hold on longer. Over roughly six months, the entire thread is broken down into small molecules your body can safely metabolize.
During those six months, the threads serve two purposes. First, barbed or cogged threads physically reposition sagging tissue, creating an immediate lift. Second, the presence of the threads triggers fibroblasts (the cells responsible for building connective tissue) to produce collagen around the thread. This collagen framework remains in place even after the thread material is fully absorbed, which is why results outlast the threads themselves.
Results Timeline: What to Expect Month by Month
Right after the procedure, you’ll see an immediate lifting effect. This is partly from the mechanical repositioning and partly from minor swelling, so the initial result can look slightly more dramatic than the final outcome.
Between months 3 and 6, the threads begin dissolving but the collagen scaffold they’ve stimulated takes over as the primary support structure. Most people find their results look natural and stable during this window. From months 6 through 12, the threads are fully absorbed, but collagen and elastin continue reinforcing the treated area. Many patients report that their skin quality actually keeps improving during this phase.
Around the 12 to 18 month mark is when most people notice the lift has softened enough to consider a touch-up. The jawline or midface gradually returns toward its pre-treatment position, though typically not all the way back to baseline thanks to residual collagen.
Thread Type Matters Less Than You’d Think
PDO threads come in three main designs: smooth (mono) threads, twisted (screw) threads, and barbed (cog) threads. Smooth threads are used primarily for skin tightening and texture improvement, while cog threads have tiny barbs that grip tissue and provide a more noticeable lift. Screw threads sit somewhere in between, offering moderate volume and tightening.
Despite these differences in function, all standard PDO threads dissolve on the same roughly 6-month timeline. The type of thread affects how dramatic the initial result looks and what area of the face it works best for, but it doesn’t significantly change how long the material lasts in your tissue.
How PDO Compares to Other Thread Materials
PDO is the most common thread material, but it’s also the shortest-lived. If longevity is a priority, two other materials are worth knowing about:
- PCL (polycaprolactone) threads last 18 to 24 months in tissue before fully dissolving, with visible results that can extend beyond two years.
- PLLA (poly-L-lactic acid) threads persist for around 24 months or longer, making them the longest-lasting option currently available.
Some newer “PDO+” or premium hybrid threads combine PDO with other materials and claim to extend results to the 12 to 18 month range for the thread material itself. Standard PDO threads remain the most affordable and widely available option, which is a large part of why they dominate the market despite the shorter duration.
What Affects How Long Your Results Last
The 12 to 18 month range is an average, and individual results vary considerably. Your age plays a significant role because older skin produces collagen more slowly, meaning the post-thread collagen response may be less robust. Skin laxity matters too. Someone with mild early sagging will generally see longer-lasting results than someone with significant volume loss or tissue descent.
Metabolism speed influences how quickly your body breaks down the thread material. People with faster metabolisms may find their threads dissolve on the earlier end of the timeline. Lifestyle factors like smoking, excessive sun exposure, and poor nutrition all accelerate collagen breakdown and can shorten the visible benefit. Conversely, good skincare habits and sun protection help preserve the collagen your body builds in response to the threads.
Maintenance and Repeat Treatments
Most practitioners describe PDO thread lifts as an 18 to 24 month maintenance procedure, meaning that’s the typical interval for repeat treatments. Waiting at least 6 to 12 months between sessions allows the collagen-building process to complete and gives the tissue time to stabilize. Going back too soon can lead to excessive scarring or inflammation rather than better results.
Some patients extend their results by combining PDO threads with other treatments like dermal fillers, skin-tightening devices, or collagen-stimulating injections. These complementary procedures can address different layers of the face and help maintain the overall effect between thread sessions. There’s no strict limit on how many times you can have PDO threads placed, but each treatment should be spaced appropriately to keep the skin healthy and avoid overloading the tissue with inflammatory responses.