Dermal filler is dissolved with an injectable enzyme called hyaluronidase, which breaks down hyaluronic acid (the substance most popular fillers are made from). The enzyme works quickly, with visible changes often appearing within hours, though full results take up to two weeks. The procedure is straightforward, typically done in a single office visit, and is one of the reasons hyaluronic acid fillers are considered the safest option: they come with a built-in reversal method.
How the Enzyme Breaks Down Filler
Hyaluronidase works by snipping the molecular bonds that hold hyaluronic acid chains together. Hyaluronic acid fillers are long polymer chains that have been chemically cross-linked to make them thick, gel-like, and long-lasting under the skin. The enzyme cuts specific bonds within those chains, breaking the gel into smaller and smaller fragments. As the structure falls apart, the filler loses its volume and firmness. The broken-down fragments are then absorbed and cleared by your body’s normal metabolic processes, just like the natural hyaluronic acid your skin produces and recycles every day.
This is purely a chemical reaction. The enzyme doesn’t burn, melt, or surgically remove anything. It temporarily reduces the viscosity of the tissue in the treatment area, essentially liquefying the firm gel so your body can flush it away.
Which Fillers Can Be Dissolved
Only hyaluronic acid fillers can be dissolved this way. That includes popular brands like Juvederm, Restylane, and Belotero. If you had one of these injected into your lips, cheeks, jawline, under-eyes, or anywhere else, hyaluronidase can reverse it.
Fillers made from other materials cannot be dissolved with this enzyme. Calcium hydroxylapatite fillers, poly-L-lactic acid fillers, and polymethylmethacrylate fillers all work through different mechanisms and don’t respond to hyaluronidase. If you have a non-hyaluronic acid filler and want it removed, the options are more limited and typically involve waiting for the product to break down on its own (which can take years) or surgical intervention. This is worth knowing before you get filler in the first place: choosing a hyaluronic acid product means you always have an exit strategy.
What Happens During the Procedure
The process is similar to getting filler in the first place, just in reverse. Your practitioner injects the hyaluronidase solution directly into the area where the filler sits, at the same depth the filler was originally placed. Precision matters here. The enzyme needs to make contact with the filler to break it down, so your practitioner will target the specific pockets of product rather than flooding the general area.
A standard clinical approach uses a diluted solution where roughly one milliliter of the enzyme solution dissolves approximately the same volume of filler. If the goal is complete removal, practitioners typically inject slightly more than the theoretical amount needed, which reduces the chance of needing a second session. The injection itself takes just a few minutes, though the full appointment may be longer depending on how much filler is being addressed.
For partial corrections (say, smoothing out a lump rather than removing all the filler), smaller, more targeted doses are used. This requires more precision and sometimes a follow-up visit to fine-tune the result.
How Quickly You’ll See Results
Most of the enzyme’s activity happens within the first 24 to 48 hours. You may notice the treated area softening or shrinking within hours of the injection. Some swelling from the injection itself can temporarily mask the changes, which is why the timeline feels gradual even though the chemistry is fast. Full results are typically visible after about two weeks. That two-week mark is when both the enzyme activity and any post-procedure swelling have fully resolved, giving you an accurate picture of the outcome.
Does It Affect Your Natural Skin
This is one of the most common concerns people have, and it’s a fair one. Hyaluronidase does not distinguish between injected filler and the hyaluronic acid your body produces naturally. It breaks down both. However, the impact on your natural hyaluronic acid is minimal and temporary.
Your body begins actively regenerating its own hyaluronic acid within two to four weeks, as the skin cells responsible for producing it ramp up their output as part of normal tissue maintenance. Hyaluronic acid levels in the treated area typically return to their pre-treatment baseline within one to three months. So while there may be a brief window where the skin in that area looks or feels slightly deflated beyond just the filler loss, it resolves on its own without intervention.
Allergy Testing Before Treatment
Some practitioners perform a small skin test before injecting hyaluronidase, placing a tiny amount in the skin and watching for a reaction. This practice is widespread in aesthetic medicine, but the evidence behind it is more nuanced than most patients realize.
True allergy to hyaluronidase is rare, occurring in roughly 1 in 2,000 people. Adverse allergic reactions affect fewer than 0.1% of patients. The British Society of Allergy and Clinical Immunology recommends against using skin tests to screen for drug allergy when there’s no clinical history suggesting one, noting that the test should be interpreted within clinical context rather than used as a blanket precaution. There is also no validated concentration for the skin test in the UK, meaning results aren’t reliably sensitive.
The most useful screening tool is your own medical history. If you have a known allergy to bee stings (hyaluronidase is a component of bee venom), you should mention this, as it may indicate a higher risk. People with a history of severe reactions to bee or wasp stings should ideally have allergy testing done at a specialized allergy clinic with anaphylaxis support available, not at a cosmetic clinic. For everyone else, your practitioner will weigh the decision based on your allergy history and prior exposures.
Side Effects and Recovery
The most common side effects are the ones you’d expect from any injection: temporary swelling, redness, bruising, and tenderness at the injection site. These typically resolve within a few days. Because hyaluronidase increases tissue permeability in the short term, swelling can sometimes be more noticeable than what you experienced when the filler was first placed, but it settles quickly.
Serious allergic reactions are the primary safety concern, but as noted above, they’re uncommon. Signs to watch for include widespread hives, difficulty breathing, or significant swelling beyond the injection site, which would require immediate medical attention.
When You Can Get New Filler
If you’re dissolving filler because you want to start fresh or correct a result, you’ll need to wait before having new filler injected in the same area. Most practitioners recommend waiting at least two weeks, which aligns with the timeline for full results from the dissolving treatment. This waiting period serves two purposes: it lets the hyaluronidase fully clear from the tissue (so it doesn’t break down your new filler), and it gives you an accurate baseline to work from. Rushing back in before the dissolution is complete makes it difficult for your practitioner to judge how much new product to use.
Some practitioners prefer to wait longer, particularly if large amounts were dissolved or if the area needs time for natural hyaluronic acid to regenerate. A wait of four to six weeks isn’t unusual for more complex corrections.