The masseter is one of the strongest muscles in the human body — responsible for chewing, clenching, and grinding. In many people, it is larger than necessary, either genetically (common in East Asian and Middle Eastern facial anatomy) or from habitual clenching and teeth grinding (bruxism). An enlarged masseter creates a wide, square lower face.

Botox injected into the masseter weakens the muscle over 1–2 weeks, reducing clenching force and jaw tension. Over the following 4–6 weeks, the muscle gradually atrophies (shrinks) because it’s being used less forcefully. The result: a slimmer, more V-shaped jawline and — for bruxism patients — significant relief from jaw pain, headaches, and tooth damage.

This is one of the most popular aesthetic treatments at Dr Azra’s clinic — particularly among women seeking a V-shape or heart-shape lower face, and patients of all genders suffering from bruxism.

Aesthetic: Jaw Slimming / V-Shape Face

• Slims a wide, square, or heavy lower jaw
• Creates a more tapered, V-shaped face contour
• Softens a masculine jawline in women
• Popular “Barbie Botox” look — lifted, sculpted lower face
• Improves facial proportions and balance — see face contouring
• Often combined with chin filler for complete lower face reshaping

Results: Visible slimming in 4–6 weeks. Maximum effect at 2–3 months. Multiple sessions recommended for dramatic results.

Medical: Bruxism & TMJ Relief

• Reduces teeth grinding force (bruxism)
• Relieves TMJ (temporomandibular joint) pain
• Reduces jaw tension headaches
• Protects teeth from grinding damage
• Reduces morning jaw soreness and fatigue

Results: Clenching force reduces within 1–2 weeks. Pain relief often noticeable within days. Repeat every 4–6 months.

Assessment

Dr Azra palpates the masseter while you clench, assessing muscle size and hypertrophy.

Injection

3–5 points per side into the bulk of the masseter. 15 minutes. Minimal discomfort.

Muscle Relaxation

Week 1–2: Clenching force reduces. Bruxism relief begins. Jaw tension eases.

Slimming

Week 4–6: Muscle atrophies visibly. Jaw appears slimmer. Maximum effect at 2–3 months.

Masseter Botox produces gradual, progressive changes to the jaw — not immediate transformation. Here is what to expect at each stage:

Day 1–7

No visible jaw change yet. Clenching force begins to reduce. Bruxism patients may notice less tension almost immediately.

Week 1–2

Significant bruxism relief. Morning jaw soreness decreases. Grinding force noticeably reduced. Headaches begin to ease.

Week 4–6

Visible jaw slimming begins. The muscle has atrophied enough to change the lower face contour. The V-shape effect becomes apparent.

Month 2–3

Maximum slimming. Jaw visibly narrower. Heart-shape and V-shape face contour most apparent. Best results after 2–3 cumulative sessions.

This is one of the most common questions patients ask. The answer is simple — they do opposite things and are often combined:

Adding chin filler to the combination creates a comprehensive lower face reshaping — one of the most transformative non-surgical results Dr Azra offers.

• Day 1–7: No visible change in jaw shape yet. Clenching force begins to reduce. Some patients notice less jaw tension.
• Week 1–2: Bruxism patients notice significant reduction in grinding force. Morning jaw soreness decreases. Headaches may reduce.
• Week 4–6: Visible jaw slimming begins. The muscle has been weakened long enough to start atrophying (shrinking in size).
• Month 2–3: Maximum slimming visible. Jaw appears noticeably narrower. V-shape effect most apparent.
• Month 4–6: Effects gradually wear off. Muscle begins to regain strength and size. Maintenance treatment recommended.

With repeated treatments (2–3 sessions), the masseter progressively reduces in size, and the slimming effect lasts longer between sessions. For post-treatment guidance, see the Botox aftercare guide.

• Wide, square, or heavy lower jaw you want to slim
• Bruxism (teeth grinding) — daytime or nocturnal
• TMJ pain, jaw tension, or jaw-related headaches
• Seeking a V-shape or heart-shape face contour
• Combining with jawline filler for lower face reshaping
• Morning jaw soreness or fatigue

• Jaw width from bone structure (not muscle) — Botox won’t help
• Severe TMJ requiring dental or surgical intervention
• Pregnancy or breastfeeding
• Neuromuscular disorders

Dr Azra palpates the masseter during consultation to determine whether width is muscular (treatable) or skeletal (not treatable with Botox).

Jawline Filler

Add definition + sculpt.

Chin Filler

Profile balance.

Face Contouring

Full contouring guide.

All Botox Areas

Full treatment guide.

Face Treatments

All options.

How Many Units

Area-by-area dosage.

Botox Aftercare

Post-treatment tips.

Botox vs Dysport

Which product?

Myths vs Facts

10 myths debunked.

Filler vs Botox

Key differences.