How Long Does Lip Filler Last and When Does It Need a Top-Up?

The short answer

Hyaluronic acid (HA) lip filler usually lasts months, not years. The clinic’s treatment page gives 6 to 12 months for most patients, with a top-up once or twice a year. Trials measure this differently: they ask whether lips are still at least one step fuller than before treatment, and in the studies below most participants still met that bar after about a year. The filler fades gradually instead of vanishing on a set date, so your doctor judges when a top-up is worth doing and sets the exact schedule.

Why lips behave differently from other areas

The lip filler treatment at the clinic page explains that lips move constantly and have a rich blood supply, so the body breaks the gel down a little faster than in stiller areas. A 2025 study by Kestemont and colleagues in Aesthetic Surgery Journal Open Forum says the same: the authors write that lip augmentation has a comparatively shorter duration than treatment of other facial areas, and that earlier studies found treatments still effective in about half of patients after 12 months.

These figures do not match one another because each source uses its own yardstick. The next section shows what the trials actually counted.

What clinical trials show

Two sources give the clearest picture, and each has limits you should know.

The first is the FDA summary for Restylane Kysse. Its pivotal trial randomized 273 adults with very thin or thin lips to Kysse or to a comparison filler. A blinded evaluator counted a participant as a responder when the lips were at least one point higher on a five-step fullness scale than at the start. A majority of Kysse participants, at least 60%, were responders through week 48. Judged by the treating investigator, 71% of upper lips and 76% of lower lips showed improvement at week 48. Participants were offered retreatment at that visit if the improvement had not held.

The second is the Kestemont study, an open-label study of 73 patients followed for 18 months, in which two authors list the filler’s manufacturer as their affiliation. Satisfactory volume restoration in both lips reached 96% at the first assessment (day 21, or day 42 after a touch-up) and stood at 77% at day 360. Figures for day 540 are reported inconsistently within the paper and rest on 42 lips, so they are not used here. Fewer patients stayed in the study as time went on, with 171 lips assessed at baseline and 133 at day 360.

Both studies used one product each, and neither counts how the lips look compared with day one. A lip can be one step fuller than baseline and still look flatter than it did after treatment. Keep that gap in mind when you compare a trial figure with your own mirror.

What changes how long your result lasts

The treatment page names three factors: the filler used, the amount injected and how quickly your body clears the gel. The page also stresses that results vary between individuals. The Kestemont study adds a practical detail: 56% of lips in that study were injected only once, and the protocol allowed up to two planned reinjections, at 6 or 9 months and at 12 months.

Our article on how the amount of lip filler is decided explains how doctors choose the volume and why they often review before adding more. The sources reviewed for this article do not show that a technique name, such as Russian lips, extends or shortens duration by itself, so treat such claims with caution and ask your doctor what to expect with your product and amount.

How to track your own result

A trial average cannot tell you when your lips have faded, so keep your own record. The treatment page says the doctor can review the lips at two weeks and that the final shape is judged at two to four weeks. Photograph your lips at that point, in the same daylight, at the same angle and without lipstick. Write down the date, the product and the amount your doctor used. At later visits you and the doctor can compare the lips with those photos and with the record, which is more reliable than memory or a fixed 6-month or 12-month rule.

The same record helps if you ever change doctors, add a new filler or need to dissolve an old one, because the first question a doctor asks is what was injected, when and where.

When a top-up makes sense

A top-up follows how your lips look and feel, not the calendar alone. The treatment page says that as the gel fades, the lips gradually return to their own shape, and that if the volume has faded unevenly the doctor examines the lips and decides whether to top up or dissolve what remains before starting a new cycle. In the Kysse trial, retreatment at week 48 used a median of 1.00 ml (range 0.10 to 2.80 ml), against a median of 1.75 ml (range 0.60 to 3.90 ml) for the first treatment and touch-up combined. The median at retreatment was lower than for the first treatment, although the two figures come from overlapping but not identical groups, and your doctor decides the amount for you.

Not everyone can have a top-up at any time. The treatment page lists pregnancy and breastfeeding, active cold sores or skin infection, dental treatment within two weeks, known allergy to hyaluronic acid or lidocaine, bleeding disorders or anticoagulant therapy, autoimmune or uncontrolled chronic conditions and a history of keloid scarring among the reasons to postpone or avoid lip filler, so review your history with the doctor before each session.

Plan around swelling as well. The treatment page advises allowing three to four weeks before a wedding, photoshoot or similar event, because swelling is most marked in the first days and the shape is judged at two to four weeks.

Does lip filler last forever?

No. The FDA notes that some dermal fillers are absorbed naturally over time, so patients may need to repeat the procedure to maintain the effect. That applies to HA lip filler, which the body breaks down gradually. If lumps or firmness appear weeks or months after treatment, they need a doctor rather than time, as the treatment page points out. If you would like the filler reduced before its natural end, a doctor can dissolve HA filler with hyaluronidase; our article on dissolving lip filler explains when that is used.

If you want an assessment of your lips and a realistic view of how long a result may last for you, you can arrange a consultation.