Somewhere between three and four months for most patients. That’s the headline answer, but the detail underneath it is more useful. The question of how long anti-wrinkle injections last comes up at almost every consultation, and the honest answer involves more variables than the marketing materials let on. Patient metabolism, dose, muscle activity, treatment area, and even how many previous treatments you’ve had all feed into the duration.
The three to four month figure
The standard quoted figure is three to four months and it’s broadly accurate as an average. We’d say roughly seven in ten of our patients fall comfortably within that window. The remaining three split between people who get less time and people who get noticeably more.
What that means in practice is that someone treated in early January will typically see the effect starting to fade somewhere between mid-April and early May. Most patients book their next treatment when they notice the muscle starting to come back rather than waiting for the lines to fully reappear.
That’s a reasonable approach. Topping up before full return tends to keep the result smooth rather than cycling through visible peaks and troughs.
Why some patients get less, and some get more
A handful of patients metabolise the product faster than average. We’re not entirely sure why, and the research literature doesn’t have a definitive answer. Higher resting metabolic rate seems to play a role. So does muscle bulk, since larger muscles often need higher doses to achieve the same duration.
Athletes, in our experience, tend to fall on the shorter end of the duration range. We had a patient who runs marathons regularly and consistently got just under three months from each treatment, where her sister (similar age, similar build, less active) got nearly five months from the same dose.
Actually, that example isn’t unique. We see it often enough to be worth mentioning during consultation.
Patients who’ve had several treatments over time often find each subsequent treatment lasts slightly longer than the last. The pattern isn’t universal, but it’s common enough to be predictable. The likely explanation is that the muscle, having been quiet for months at a stretch, weakens slightly between treatments. A weaker muscle needs less product to keep it relaxed and the effect lingers further. By the third or fourth treatment, some patients are getting closer to five months between sessions.
That’s one of the reasons we usually advise sticking with treatment rather than stopping and starting. Consistency tends to produce better-calibrated long-term results.
Area-specific variation
Different muscles respond differently. Crow’s feet treatment, for example, often lasts slightly longer than forehead treatment in the same patient. Masseter treatment for jaw clenching can last six months or longer because the muscle is large and the dose tends to be substantial.
| Treatment area | Typical duration | Notes |
|---|---|---|
| Forehead | 3 to 4 months | Among the shortest-lasting areas |
| Frown lines | 3 to 4 months | Often the most consistent |
| Crow’s feet | 3 to 5 months | Slightly longer than forehead in many patients |
| Bunny lines | 3 to 4 months | Smaller dose, similar duration |
| Masseter (jaw) | 4 to 6 months | Larger muscle, higher dose, longer effect |
| Chin (mentalis) | 3 to 4 months | Standard duration range |
Patients sometimes assume that all areas wear off at the same rate. They don’t, and the variation is worth knowing about when you’re planning your treatment schedule.
In our experience, patients who treat multiple areas in a single appointment often notice them fading at slightly different times. The forehead might come back online before the crow’s feet, for instance. That can produce an oddly mismatched look in the late phase, which is another reason for booking the next appointment a touch early rather than late.
What “wearing off” actually feels like
The fade is gradual. You won’t wake up one morning to find the effect has vanished overnight. Instead, you’ll notice the treated muscles starting to twitch or feel active again over the course of one to two weeks.
Some patients spot the change immediately. Others don’t notice until someone comments on a returning frown or until they catch sight of themselves in a mirror mid-expression. In our experience, partners often spot it before the patient does.
The lines themselves take longer to come back than the muscle activity. There’s a window of a few weeks where the muscle is moving again but the skin hasn’t yet re-creased. If you book your follow-up during that window, you can keep the lines from re-establishing.
Should you wait until it’s fully worn off?
You’ll find advice online suggesting you should always wait for full return of muscle activity before retreating. In our experience, that’s not always the right approach.
Letting the muscle come fully back online before treating again means the lines re-form during the gap. Catching the muscle while it’s still partly relaxed maintains the smoothing more consistently. The exception is masseter treatment, where the muscle bulk is large and we generally do recommend allowing more recovery between sessions.
Some patients prefer the cycle of obvious return and full retreatment. Others prefer steady maintenance. Both are reasonable.
A small minority of patients develop what’s called immune resistance over time. The body produces antibodies to the product, and subsequent treatments work less effectively or wear off faster. This is more common with very frequent dosing or with treatments above the recommended range. It’s rare in routine practice. We’ve seen it in maybe one or two patients in many years of treatment, and both had been getting much higher doses elsewhere before coming to us. Switching to a different brand of product (still prescription-only) typically resolves the issue, since the antibodies tend to be specific to one formulation.
This is one of the reasons we don’t recommend chasing maximum dose at every appointment. Less is often more, and it preserves the long-term responsiveness of the muscle.
Lifestyle factors that change how long it lasts
Beyond metabolism and dose, several day-to-day habits feed into how long a treatment holds. Sun exposure is one of the bigger ones. Consistent UV damage accelerates the kind of static lining that injectables don’t address, so even when the muscle is quiet, the surrounding skin can develop new creases that look like the treatment is wearing off when it isn’t. Sunscreen, in our experience, is one of the most cost-effective adjuncts to any aesthetic treatment.
Smoking sits in a similar category. The habit doesn’t directly degrade the active ingredient, but the underlying skin quality drops in ways that make the result look less polished. Patients who quit smoking between treatments often report that the second round looks noticeably better even at the same dose. We’d never push a patient to quit on aesthetic grounds alone, but it’s worth mentioning when the question comes up.
Sleep, hydration, and stress all play smaller but real roles. Patients going through a particularly stressful period often clench more, which can shorten visible effect on forehead and jaw treatments specifically. None of this is something to rebuild your life around, but it’s the kind of context that gets missed in a quick clinic visit.
Planning your year
Most patients settle into a rhythm of three or four treatments per year. Some space them out around significant events (weddings, holidays, work milestones). Others maintain a steady three-monthly schedule regardless of calendar.
In our experience, the patients who get the most predictable results are the ones who book their next appointment before they leave the current one. Drift creeps in when treatment becomes reactive rather than scheduled. A standing booking three months out, with a quick reassessment at the start of each appointment, tends to produce the steadiest long-term outcome.
If you’re trying to work out a realistic schedule for your circumstances, we’re happy to map it out with you. Our team at Westcliff Dental Practice will give you a candid view of how often you’d realistically need to come in based on your goals, your anatomy, and your budget. Call us on 01702 344 500 to book a consultation. The NHS information page on non-surgical cosmetic procedures is a useful background read if you want a neutral overview before booking.
