Most dermal fillers are not permanent. The vast majority of fillers used today are designed to be gradually absorbed by your body over months or years, with results typically lasting 6 to 24 months depending on the product and where it’s injected. There is one FDA-approved filler that is truly permanent, but it accounts for a small fraction of procedures and carries unique risks.
How Long Temporary Fillers Actually Last
Hyaluronic acid fillers are by far the most popular type, and they’re fully temporary. Your body naturally produces hyaluronic acid and also produces enzymes that break it down. Injected filler follows the same fate: those enzymes gradually degrade it until your body absorbs it completely. The timeline depends heavily on where the filler is placed.
Lips see the fastest breakdown because the muscles there move constantly throughout the day, chewing, talking, and making expressions. Lip filler typically lasts 6 to 9 months. Cheek filler lasts longer, usually 9 to 12 months, because the tissue is deeper and less mobile. Under-eye filler sits in a relatively still area and can last 9 to 18 months. Deep injections and newer, thicker products can maintain their effect for up to two years.
One important nuance: “lasting” doesn’t mean the filler vanishes all at once. It fades gradually, so you’ll notice a slow return toward your pre-treatment appearance rather than a sudden change. That’s why most people schedule touch-ups before the filler is completely gone.
Fillers Can Linger Longer Than Expected
MRI imaging has revealed something that complicates the simple “6 to 18 months” timeline. In one study tracking hyaluronic acid filler over time, MRI scans showed filler persisting in the mid-face and lateral face at 27 months after injection, even though the chin area showed near-complete breakdown by 19 months. Other research has found hyaluronic acid detectable for up to 12 years in certain locations, depending on the product, depth of placement, and volume injected.
This doesn’t mean your results will look the same for years. The visible effect fades as the filler breaks down and loses its structure. But trace amounts of filler material can remain in the tissue well beyond the window when you stop noticing its cosmetic benefit. Filler injected into deeper fat compartments appears to persist longer than filler placed superficially or in high-movement areas.
Collagen-Stimulating Fillers: A Middle Ground
Two products work differently from standard hyaluronic acid fillers. Instead of simply adding volume, they stimulate your body to build new collagen around the injected material.
Radiesse uses calcium-based microspheres suspended in a gel. The gel provides immediate volume, then the microspheres act as a scaffold that triggers your skin cells to produce new collagen and elastin over 8 to 12 weeks. The injected material eventually absorbs, but the collagen your body built stays behind. Results typically last 12 to 18 months, with touch-ups recommended on that same schedule.
Sculptra takes a slower approach. It contains no gel, so there’s no immediate filling effect. Instead, its microparticles trigger an inflammatory response that prompts collagen production over weeks and months. Results build gradually and often last two years or more. Touch-ups are generally needed every 18 to 24 months to maintain the effect.
Neither of these products is reversible. Unlike hyaluronic acid fillers, which can be dissolved with an enzyme injection, both collagen stimulators have to be absorbed by the body on their own timeline.
The One Truly Permanent Filler
Bellafill is the only FDA-approved permanent dermal filler available in the United States. It contains tiny plastic microspheres (polymethylmethacrylate, or PMMA) suspended in a collagen gel. The gel absorbs over time, but the PMMA microspheres do not. They remain in your tissue indefinitely.
The FDA labeling states this clearly: implantation is permanent and will not be reversed without physical removal. That permanence is both the appeal and the risk. If you’re happy with the result, you won’t need regular touch-ups. If something goes wrong, your options are limited.
Post-marketing data from Bellafill’s clinical trials showed that the most frequently reported complications were lumps, bumps, swelling, nodules, and granulomas (hard inflammatory reactions around the microspheres). These problems appeared anywhere from immediately after injection to three and a half years later. Treatment for complications ranged from massage and ice packs to steroid injections and, in some cases, surgical excision of the implant material.
Why Reversibility Matters
One of the biggest practical advantages of hyaluronic acid fillers is that they can be undone. An enzyme called hyaluronidase breaks down hyaluronic acid rapidly when injected into the filler site. It starts working almost immediately, with a half-life of just two minutes, and most results are visible within 24 to 48 hours. For denser, more heavily cross-linked products, full dissolution may take closer to 48 hours. If needed, the treatment can be repeated at 48-hour intervals.
This reversibility is especially valuable when filler migrates. Migration happens when the injected material shifts away from where it was placed, creating lumps or puffiness in unintended areas. Common causes include injection too close to the skin surface, overfilling that creates internal pressure, and physical pressure on the area after treatment. In cases of significant migration, the standard approach is dissolving the misplaced filler entirely and starting fresh once the tissue has settled.
With permanent fillers or collagen stimulators, migration or misplacement is far more difficult to correct. There’s no enzyme that reverses them, so complications may require steroid injections to reduce inflammation or surgical removal of the material.
Typical Touch-Up Schedules by Area
If you’re considering temporary fillers, the maintenance schedule is a practical factor worth planning for:
- Lips: every 6 to 9 months
- Cheeks, chin, and jawline: every 9 to 18 months
- Nasolabial folds and marionette lines: roughly once a year
- Under-eyes: every 12 to 18 months
- Sculptra (collagen stimulator): every 18 to 24 months
These are averages. Your individual metabolism, the specific product used, and how expressive your face is all shift the timeline. Some people metabolize filler noticeably faster than others, while some find their results holding well beyond the expected range. Most practitioners recommend scheduling a follow-up before results fully fade so there’s a smoother transition rather than a cycle of filling and losing volume.