

By precisely relaxing the over-active masseter muscles at the angle of the jaw, small doses of Botox® (or its equivalents Dysport® / Xeomin®) can:
Narrow a square or bulky lower face caused by thick masseters
Ease jaw tension, clenching, and bruxism-related pain
Improve TMJ symptoms such as headaches, earache, or limited jaw opening
Complement dermal-filler contouring for an overall balanced look
Eager to learn the ins and outs of Botox treatments and after-care? Browse our Botox Guide.
Patients interested in similar muscle-relaxing results for the neck and shoulders may also benefit from trapezius Botox (Trap Tox).
Mapping & dosing – Dr. Susana Querido pinpoints the densest area of each masseter with ultrasound‐level palpation.
Micro-injections (4–6 per side) – Botulinum-toxin type A is placed into the central belly of the muscle, not the parotid or smile-line areas.
Muscle relaxation – Over the next 2 weeks the masseter contracts less forcefully, allowing the muscle to slim 2–6 mm per side.
Results & maintenance – Peak contour appears around week 6 and lasts 3–4 months; repeat 2–3 times per year to maintain a tapered jawline and symptom relief.
| Treatment Area | Typical Units* | Session Time | Discomfort | Back-to-Work | Full Effect | Longevity |
|---|---|---|---|---|---|---|
| Masseter muscles (jaw angle) | 25–40 units per side | 15 min | Mild, no anaesthetic needed | Same day | ~ 6 weeks | 3–4 months |
*Exact dose is personalised; higher units may be needed for very strong masseters.
Visibly wide or square jaw due to muscle bulk—not bone.
Chronic jaw clenching / bruxism or TMJ discomfort.
Seek a subtler, more feminine or heart-shaped lower face.
Prefer a fast, non-surgical option with minimal downtime.
Not pregnant / nursing and free of neuromuscular disorders
Downtime: Tiny blebs or redness fade in < 30 minutes.
After-care: No heavy chewing, facials, or lying face-down for 4 hours.
Follow-up: Optional touch-up at 2 weeks if muscle strength is uneven.
Treatments performed or supervised by Dr. Susana Querido, board-certified in Family, Aesthetic & Anti-Aging Medicine.
Ultrasound-guided depth when needed for maximum precision.
Option to bundle with dermal fillers for full lower-face harmony.
Book your Botox® Facial Slimming consultation today and see how a few strategic injections can refine your profile and relieve jaw tension—quickly and safely.
Conveniently serving patients from Stamford, Greenwich, and nearby communities.
Dosage is personalised, but most adults need 25–40 units per side (total 50–80 units). Stronger or male masseters can require more; your exact dose is determined during consultation.
Discomfort is minimal. We use a very fine needle; most patients describe the injections as quick “pin-pricks.” Numbing cream or ice can be applied on request.
You’ll feel jaw tension ease within 7–10 days, but visible contouring develops gradually as the muscle thins. Peak slimming appears around Week 6.
Normal chewing is maintained. Only intense, prolonged clenching strength is reduced. If you grind at night, you’ll likely notice less morning soreness without functional issues.
Masseter slimming and TMJ relief last 3–4 months. Re-injecting two to three times per year keeps the jawline tapered and symptoms controlled.
Absolutely. Many patients pair masseter reduction with chin or jawline fillers—or with radio-frequency skin tightening—to create an overall V-shape. Treatments can be done in the same visit or staged.
When performed by a qualified clinician, risks are very low. Temporary bruising, mild swelling, or headache can occur. Rarely, an overly weak masseter can cause chewing fatigue—this resolves as the toxin wears off.
Yes—if you discontinue injections, the masseter will gradually regain bulk over 4–6 months, returning to your natural jaw width. There is no permanent change.
Pricing depends on the number of units required. We’ll provide an exact quote after assessing your muscle size and goals during your consultation.
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Greenwich MD is an independent aesthetic medicine practice located at 1351 Washington Boulevard, Suite 803, Stamford, Connecticut 06902. Founded and led by Dr. Susana Querido, MD. Greenwich MD is not affiliated with Greenwich Medical Spa or any other practice with a similar name.