Botulinum toxin · Masseter
Masseter botulinum toxin
The masseter is the chewing muscle, at the angle of the jaw. When the muscle is prominent, it widens the lower face and gives the jaw a squarer angle.
Botulinum toxin reduces the force of the muscle's contraction. Over 4 to 6 weeks, the muscle loses volume and the jaw angle softens. You still chew everything you chewed before.
A 30-minute session, €299. If you have pain or other symptoms, consult a doctor or dentist first.
What changes with masseter treatment
Botulinum toxin in the chewing muscle at the angle of the jaw. A prominent masseter gives the lower face a wider, squarer look; relaxed, the muscle loses volume over 4 to 6 weeks and the jaw angle softens. You still chew everything you chewed before.
Is it for you?
A prominent masseter muscle that gives the lower face a wide or square look. Men and women. Not during pregnancy or breastfeeding, and not with certain neuromuscular conditions; we go through the list at the consultation. If you have pain or other symptoms, consult a doctor or dentist first.
What happens in the session
A few injections on each side with a fine needle. A brief pressure, no anaesthetic. Thirty minutes, both sides included.
What you'll see, and when
The contour changes between the fourth and sixth week, once the muscle has lost volume. It lasts 4 to 6 months, and the interval tends to grow with repeat sessions.
After the treatment
Nothing to recover from. Carry on with your day.
Why it looks natural
The masseter is a chewing muscle, not an expression muscle, so relaxing it changes nothing in how your face moves. You still chew everything you chewed before. And the change arrives the way a natural one would: the muscle loses volume gradually over 4 to 6 weeks, so the contour softens at a pace nobody around you can date to a treatment.
Honest answers
Will it show? The contour changes between the fourth and sixth week. Gradual enough that the people around you notice without being able to say when.
Does it hurt? A few injections on each side with a fine needle. A brief pressure, no anaesthetic.
What if I don't like it? The toxin cannot be dissolved; it wears off on its own in 4 to 6 months. Dosing conservatively the first time is part of the plan.
How we do it at Cosmo Clinic
Once the muscle has slimmed, jawline filler or chin filler can draw the contour; the order is decided at the consultation. €299 per treatment. The consultation is free.
Options and prices
| Treatment | Price |
|---|---|
| Botulinum toxin — special area (gummy smile, bunny lines, nose tip, chin) | 120 € |
| Botulinum toxin — 1 area (frown lines or crow's feet) | 150 € |
| Botulinum toxin — forehead | 189 € |
| Botulinum toxin — 2 areas | 249 € |
| Botulinum toxin — 3 areas | 317 € |
| Botulinum toxin — masseter | 299 € |
| Lip flip | 99 € |
The plan and the final figure are confirmed at the assessment consultation, at no cost.
At a glance
What to expect
Results
- A narrower jaw and a softer angle.
- Contour visible between the fourth and sixth week.
- Lasts 4 to 6 months.
Key features
- 30-minute session, no anaesthetic.
- Same-day return.
- For men and women.
- €299, price per treatment.
Frequently asked questions
Short answers to the questions we hear every day. Everything else belongs in the consultation.
How does it work?
Botulinum toxin reduces the force with which the masseter contracts. A muscle that works with less force loses volume over the following weeks, and the jaw angle softens.
Does it hurt?
A few injections on each side with a fine needle. The area is muscular and you feel a brief pressure. We do not use anaesthetic.
When does the result appear?
Between the fourth and sixth week, once the muscle has lost volume.
How long does it last?
Between 4 and 6 months. With repeat sessions the interval tends to grow, as the muscle adapts its force.
Can I combine it with other treatments?
Yes. With jawline or chin filler, to draw the contour once the muscle has slimmed. The order is decided at the consultation.
How much does it cost?
€299 per treatment, both sides included. The assessment consultation is free.
Who should not have it?
Pregnant and breastfeeding women, people with neuromuscular conditions and people on certain antibiotics. We go through the list with you at the consultation.
Similar treatments
Botulinum toxin · Bunny linesBunny lines botulinum toxin
Softens the small lines on the sides of the nose.
Botulinum toxin · ChinChin botulinum toxin
Smooths the orange-peel texture of the chin when you talk or smile.
Botulinum toxin · Crow's feetBotulinum toxin for crow's feet
Softens the lines beside the eyes without taking the smile.
Related articles
To read before you decide, in your own time.
Botulinum toxinHow long does botulinum toxin last? Three to six months, depending on you
It is the question everyone asks before a first treatment. The answer has numbers by area, a day-by-day calendar, and three or four things that make the effect last longer or shorter in your case.
Botulinum toxinBotulinum toxin aftercare: the first 24 hours
Almost every question comes after the treatment. Can you go to the gym? Lie down? Have a glass of wine at dinner? Wash your face? The answers, with the reason behind each one.
Clinical guideBotulinum toxin: what can go wrong, and what cannot
Anyone considering botulinum toxin deserves numbers, not alarm and not reassurance. The common effects and how long they last, the rare complications and how they happen, who should not have it, and what changes with who injects.
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