How Long Does Botox Last? Duration, Onset & Units Explained

If you’re considering Botox, one of the first things you’ll want to know is how long it actually lasts — and how soon you’ll see anything at all. The short version: results typically take a few days to appear and last around three to four months. But the details vary by area, dose, and person, so here’s a clearer picture to set your expectations.

How long does Botox take to work?

Botox doesn’t work instantly. It gradually relaxes the treated muscles, so the change appears over days rather than minutes.

• Days 1–2: Usually little to no visible change.
• Days 3–5: Most people begin to notice lines softening.
• Days 10–14: The full effect has typically settled in.

If you’re wondering how long for Botox to work before an event, plan your treatment at least two weeks ahead. That gives the result time to develop and leaves room for a touch-up if you and your provider decide one is needed.

How long does Botox last?

For most facial wrinkle treatments — forehead lines, frown lines, crow’s feet — Botox generally lasts three to four months. Some people find certain areas hold longer, occasionally up to about six months, while others metabolize it faster. As the effect fades, muscle movement gradually returns and lines slowly reappear.

Treatment area	Typical duration
Forehead lines	3 – 4 months
Frown lines (between brows)	3 – 4 months
Crow’s feet	3 – 4 months
Masseter (jaw)	4 – 6 months

How long does masseter Botox last?

Masseter Botox — used to ease jaw clenching, grinding, or to soften a square jawline — often lasts a bit longer, commonly four to six months. The masseter is a large, powerful chewing muscle, so it tends to hold the effect longer than the smaller muscles of the upper face. Individual results still vary.

How many units of Botox for forehead and other areas?

Dosing is personal — it depends on your muscle strength, anatomy, and the look you want. Only a qualified provider can decide the right amount for you. That said, these are commonly discussed general ranges:

• Forehead lines: often around 10–20 units
• Frown lines (between the brows): often around 15–25 units
• Crow’s feet: often around 5–15 units per side
• Masseter: often around 20–30 units per side

Stronger muscles usually need more units, which is one reason a first appointment often includes a conversation about your goals rather than a fixed number.

What affects how long Botox lasts?

Several everyday factors influence longevity:

1. Dose. A lower dose may wear off sooner than a fuller one.
2. Muscle strength. Stronger, more active muscles tend to bounce back faster.
3. Metabolism and activity level. Some people simply process it more quickly.
4. Treatment area. Larger muscles like the masseter often hold longer.
5. Consistency. People who re-treat regularly sometimes notice results lasting a little longer over time.

How often can you get Botox?

Because the effect fades over a few months, many people re-treat roughly every three to four months. Providers generally suggest not going more frequently than about every twelve weeks. Treating too often can, for some people, increase the chance of the body developing resistance, which makes future treatments less effective.

The best schedule is the one you set with your provider based on how your results wear off — not a fixed calendar rule. Always talk to a licensed professional about your dosing and timing.

Preview your result before your first appointment

The hardest part of any cosmetic decision is picturing the outcome on your own face. Before you book, you can visualize a smoother, more relaxed look and decide what actually feels right for you.

Pody’s AI tools let you upload a photo and preview realistic results in seconds, so you can walk into a consultation knowing what to ask for. Explore the plastic surgery simulator, and if you’re planning treatment, read our guide on what not to do after Botox to protect your results.

Knowing how long Botox lasts is the first step — seeing what it could look like is the fun part.