Skin science · 5 min read
Is Filler Permanent? Migration, Longevity and Dissolving Explained
Filler is sold as temporary. The truth is more nuanced, and it changes how you should think about how much to have.
Two fears sit behind most filler consultations: that it will migrate and change the shape of the face, and that once it is in, it cannot be undone. Both concerns are legitimate. Both are also more manageable than the stories suggest, provided you understand how the product actually behaves.
How long it really lasts
Hyaluronic acid fillers are marketed as lasting six to eighteen months depending on the product and the area. That is broadly true of the visible effect. What is less often said is that imaging studies have shown filler persisting in the tissue for considerably longer than its visible effect, sometimes years. The product does not vanish on schedule; it slowly loses volume and integrates, and some remains.
This has a practical consequence. If you top up every six months on the assumption that the previous treatment has gone, you are adding to a base that has not fully cleared. Over several years this is how faces gradually become overfilled without any single treatment being excessive. The correct approach is to assess each time and treat only what has actually been lost, not to repeat a fixed dose on a fixed schedule.
Migration
Filler can move from where it was placed. It is most visible in the lips, where product placed in the body of the lip can drift above the border and produce the flat, shelf-like upper lip that has become recognisable. It also occurs under the eyes and along the nasolabial fold.
Migration is caused by a combination of too much product, product placed in a plane where the muscle pushes it, repeated treatment on top of existing filler, and strong muscle activity. It is far less likely with conservative volumes, correct depth of placement, and enough time between treatments. It is not random, and it is largely a technique and volume issue.
Dissolving
Hyaluronic acid filler can be dissolved with hyaluronidase, an enzyme that breaks it down within hours to days. This is what makes HA fillers the appropriate first choice for almost everyone: the result is reversible. Dissolving is used to correct overfilling, migration, lumps and asymmetry, and as an emergency treatment if a blood vessel is compromised.
Three things to know. First, hyaluronidase dissolves the filler you want gone and also some of your own natural hyaluronic acid, so the area can look slightly deflated for a couple of weeks before it recovers. Second, older, migrated or heavily cross-linked filler sometimes needs more than one session. Third, once dissolved, you should generally wait two to four weeks before re-treating, so the tissue settles and the new placement can be judged accurately.
Fillers that cannot be dissolved
Calcium hydroxylapatite (Radiesse) and poly-L-lactic acid (Sculptra) are biostimulators rather than pure fillers, and they cannot be reversed with hyaluronidase. They have excellent uses, particularly for the jawline and for diffuse volume loss, but they should be used by someone experienced and, in my view, not as a first filler in a new patient. Permanent fillers, such as silicone, should not be used at all.
The rule that follows from all this
Use less than you think you need, use a reversible product, place it correctly, and reassess rather than repeat. A patient who follows that rule for ten years looks like herself. A patient who tops up on a schedule frequently does not.
Common questions
How long does dermal filler last?
The visible effect of hyaluronic acid filler typically lasts six to eighteen months depending on the product and area. Imaging studies show some product persists in the tissue for longer, which is why treatments should be assessed each time rather than repeated on a fixed schedule.
Can lip filler migrate?
Yes. Migration above the lip border is the most common form and is usually caused by too much product, placement in the wrong plane, or repeated treatment on top of existing filler. Conservative volumes and correct technique make it much less likely.
Can filler be dissolved?
Hyaluronic acid filler can be dissolved with hyaluronidase, usually within hours to days. Radiesse and Sculptra cannot be dissolved this way, which is one reason a reversible HA filler is the right first choice for most patients.
Does dissolving filler damage your face?
Hyaluronidase also breaks down some of your natural hyaluronic acid, so the area can look slightly deflated for a couple of weeks before recovering. It does not cause lasting damage when used appropriately.
How soon after dissolving can I have filler again?
Generally two to four weeks, so the tissue settles and the new treatment can be planned accurately.
Dr. Mazzuca is a licensed physician practising medical aesthetics in Markham, Ontario, with additional training in cosmetic medicine, facial anatomy, women's health, and longevity medicine. Every treatment at the clinic is performed by her personally. Her registration can be verified through the College of Physicians and Surgeons of Ontario.
Written and medically reviewed by Dr. Monique Mazzuca, MD, CCFP. Published September 11, 2026.
This article is general information, not medical advice, and it is not a substitute for an in-person assessment. Results vary between patients, and every treatment carries risks that are reviewed with you before you consent. Suitability is determined by Dr. Mazzuca at your consultation.
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