It is the question I am asked more than any other at consultation. The honest answer is the one most articles do not give you, because it sounds less impressive: it depends on you. On your metabolism, your lifestyle, your starting anatomy, and the product I choose for your particular lips. The standard “6 to 12 months” you read everywhere is a useful guide — and very often wrong in both directions.
Below is the answer I give in clinic, in full.
The honest, clinical answer
For most healthy adults, a hyaluronic acid lip filler will give you a noticeable shape and hydration boost for around six to nine months. The visible cosmetic effect tends to fade gradually somewhere between month nine and month twelve. After that, although the body has metabolised most of the product, there is some evidence that the lips themselves remain slightly fuller and better hydrated than they were before treatment.
The real question isn't how long it lasts. It's how it ages — and whether it ages with you.
What affects longevity
Three things matter much more than the product brand:
1. Your metabolism
The faster your metabolism, the faster you process hyaluronic acid. Runners, regular gym-goers and clients on certain medications will often see results soften a little sooner. This is not a problem — it just means we plan your top-ups closer together.
2. Lip use
The lips are the most mobile part of your face. Heavy smokers, brass players, frequent gum-chewers — anyone whose lips work hard during the day — will tend to metabolise filler faster. Again, useful information for planning, not a reason to avoid treatment.
3. Volume placed
A smaller, more conservative initial treatment generally lasts a similar length of time to a larger one — but appears to fade sooner because there is less product to lose before the change becomes visible. This is one of the reasons I recommend building up gradually rather than going for a large first treatment.
So how often should I top up?
For most of my clients, the pattern looks something like this:
- First treatment — conservative volume, often 0.5–0.7ml
- Six-week review — review the shape, top-up if we agreed to build gradually
- Six to nine months later — maintenance top-up, usually 0.5ml
This is a guide, not a recipe. Some clients prefer to come once a year; others choose to let the filler dissolve entirely and reset. There is no wrong way.
A note on dissolving
Hyaluronic acid filler can be dissolved with an enzyme called hyaluronidase if you do not like the result, if a complication arises, or if you simply want to start again. This is one of the reasons I do not work with permanent fillers — the reversibility of HA is, to my mind, a significant safety feature.
When to come and see me
If you are considering your first treatment, book a consultation. It is free, and there is never any expectation to book treatment afterwards. We will look at your face, talk through your hopes, and only proceed if we both agree the plan is right.
If you are an existing client and you are wondering whether it is time for a top-up — the simplest test is the camera roll on your phone. Look at a photograph of yourself from a month after your last treatment, and one from yesterday. If they look meaningfully different, it is probably time.