Masseter botulinum toxin
Cosmo Clinic Team
Masseter Botox is a clinically established treatment that uses botulinum toxin type A to relax the masseter, the large chewing muscle at the angle of the jaw. By reducing excessive muscle contraction, it eases bruxism (teeth grinding) and jaw clenching, and can soften a wide or square lower face for a slimmer jawline. It is a well-studied, minimally invasive procedure.
At Cosmo Clinic in Lisbon, masseter treatment is approached from both a functional and aesthetic perspective. Our doctors assess jaw muscle size, bite patterns, and patient history before recommending dosage. Full results develop over four to six weeks as the muscle responds to treatment.
Book a free first consultation with one of our English-speaking doctors at Cosmo Clinic to discuss whether masseter botulinum toxin is right for you.
Results
Noticeable reduction in jaw clenching and teeth grinding.
Improved comfort and confidence in daily life.
Jaw-clenching relief within 1–2 weeks; slimming develops over 4–6 weeks, lasting 3–6 months.
Non-surgical, fast, and discreet treatment.
Key Features
Clinical Guide
Botulinum Toxin: Complete Guide
Mechanism, treatment areas, real protocol, recovery and contraindications.
FAQ
How does masseter Botox work?
Botulinum toxin is injected directly into the masseter muscle, reducing its contraction force. For bruxism: relieves morning jaw pain and reduces teeth grinding. For aesthetics: the muscle gradually atrophies over 3–4 weeks, slimming and defining the jawline.
Is the treatment painful?
Minimal discomfort. The masseter is a thick muscle and the 30G needle causes only a brief sting. Most patients do not require topical anaesthetic.
When will I see results?
For bruxism relief: 3 to 5 days. For jawline slimming: 3 to 4 weeks, as the muscle gradually reduces in volume with reduced use.
How long does masseter Botox last?
Between 4 and 6 months for bruxism. For jawline slimming, many patients report 5 to 7 months. With regular maintenance, the effect can extend to 8 months.
Can I combine it with other treatments?
Yes. It is frequently combined with jawline filler or nose filler in facial harmonisation protocols. Your doctor will assess the best combination at your free consultation.
How much does masseter Botox cost in Lisbon?
At Cosmo Clinic, treatment starts from €299. The exact price is confirmed at your free consultation, after the doctor assesses muscle size and the appropriate protocol.
Does masseter Botox treat bruxism (teeth grinding)?
Yes. Reducing masseter muscle force decreases nocturnal grinding, relieves morning jaw pain, and reduces dental wear. For moderate to severe bruxism, it is one of the most effective non-surgical approaches available.
Are there any contraindications?
The standard contraindications for botulinum toxin apply: pregnancy, breastfeeding, neuromuscular disorders (e.g. myasthenia gravis), documented allergy to the toxin or albumin, and active infection at the injection site. We assess all of these at your consultation.
