Does permanent filler exist? Hyaluronic acid vs. PMMA
Permanent products exist, with PMMA (polymethyl methacrylate) being the best known, but permanent filler, in the sense of "do it once and look good forever", does not exist. A permanent product stays in the tissue, but the face keeps aging around it, and complications can appear years later, with no simple way to reverse them. That is why aesthetic use of PMMA is discouraged by many organizations and has been restricted by professional councils in Brazil. The usual fillers in harmonization are made with hyaluronic acid, which is absorbed over time and can be broken down if there is a problem.
This page helps you answer the patient who asks "isn't there one that lasts forever?" and recognize the patient who already has a permanent product.
What is the difference between hyaluronic acid and PMMA?
| Aspect | Hyaluronic acid | PMMA |
|---|---|---|
| What it is | Gel of a substance that exists in the body itself | Microspheres of a synthetic polymer in a carrier |
| In the body | Absorbed gradually | The carrier is absorbed; the microspheres stay forever |
| Duration | Temporary, generally months to a little over a year depending on the area | Permanent |
| Reversal | Possible with hyaluronidase | No enzyme; surgical removal, often partial |
| Late complications | Possible, but the product tends to go away | Lumps and granulomas can appear years later |
| Keeps up with aging | Yes, with adjusted maintenance | No; the face changes and the product stays |
Hyaluronic acid durations by area are in facial harmonization: how long it lasts.
Why is a permanent product risky?
What looks like an advantage, lasting forever, is precisely the problem:
- A complication with no simple way out. If a lump, chronic inflammation, or an infection associated with biofilm appears, there is no enzyme to dissolve it. Removal, when possible, is surgical and often incomplete.
- Late complications. Inflammatory reactions and granulomas can appear a long time later, sometimes triggered by infections, procedures, or other factors.
- The face changes, the product does not. With aging and the loss of fat and bone, a product that was once harmonious can become visible, displaced, or out of proportion.
- No margin for error. An excess of volume with hyaluronic acid can be corrected. With a permanent product, the excess tends to stay.
What do the regulations say about PMMA?
In Brazil, PMMA is a high-risk product, regulated by ANVISA (the Brazilian health regulatory agency), with specific approved indications, mostly tied to reconstructive treatments. In 2026, the Federal Council of Medicine (CFM) and the Federal Council of Dentistry (CFO) published rules restricting their members' use of PMMA as a filler for purely aesthetic purposes, while keeping the reconstructive exceptions set out in the rules themselves. The rules may change and differ between professions.
And "long-lasting" products?
Some patients confuse longer-acting products with permanent ones. Collagen biostimulators, such as polylactic acid, polycaprolactone, and calcium hydroxylapatite, are absorbable: the material is eliminated over time, and part of the effect comes from the collagen they stimulate. They can last longer than some hyaluronic acids, but they are not permanent and, in general, hyaluronidase does not reverse them.
| Group | Example | Absorbable? | Reversal with an enzyme? |
|---|---|---|---|
| Hyaluronic acid | Fillers for lips, under-eyes, cheekbone | Yes | Yes |
| Biostimulators | Polylactic acid, polycaprolactone, hydroxylapatite | Yes, over longer timeframes | Generally no |
| Permanent | PMMA | No | No |
The comparison between biostimulator and filler is in biostimulator or filler.
What about a patient who already has PMMA?
They need a more careful assessment before any procedure in the area. New injections over a permanent product can trigger inflammation, and hyaluronidase does not act on it. Ask, record, and, when the patient does not know what was injected, follow the guide for a patient with an unknown previous filler. Document everything in the informed consent.
How to respond to a request for "something that lasts longer"?
The request is legitimate: the patient wants to spend less time and money on maintenance. It is worth showing what is possible safely: a predictable maintenance plan, products suited to each area and, when indicated, biostimulators. The logic of maintenance is in facial harmonization: maintenance. For specific areas, see lip filler: how long it lasts and permanent nonsurgical rhinoplasty.
In Harmy, the projection is an illustrative simulation of the result with the planned ml, and it does not say how long it will last. Use the image to align the goal and, in the same conversation, explain the usual durability and the maintenance of the chosen product.
Frequently asked questions
Is there such a thing as permanent lip filler?
Permanent products exist, such as PMMA, but their use for aesthetic purposes is discouraged because of complications that can appear years later and have no simple reversal. The usual lip fillers are made with hyaluronic acid, which is absorbed over time.
What is the difference between hyaluronic acid and PMMA?
Hyaluronic acid is absorbable and can be broken down with hyaluronidase if there is a problem. PMMA is made of microspheres that the body does not absorb, so they stay in the tissue forever and, in case of a complication, removal is usually surgical and often incomplete.
Does permanent facial harmonization exist?
Not in the way patients imagine it. Even when a permanent product is used, the face keeps aging around it, and the result changes. The usual harmonization procedures are temporary and require maintenance.
Is permanent under-eye filler safe?
A permanent product in an area of thin skin and high vascular risk, such as the under-eye area, stacks the risks of a permanent product on top of those of the area. The usual approach is to use absorbable, reversible products, at the professional's discretion.
Harmy images are illustrative simulations generated by AI from the patient's photo to support the conversation between practitioner and patient. They are not a promise of results. Indication, technique, product and volume are solely the decision of the licensed practitioner. This content is for information only and does not replace a clinical assessment.