Jaw Slimming Injections
Jaw slimming injections by GMC Specialist Register plastic surgeons. Masseter muscle treatment for jawline contouring and bruxism. From £695. CQC-regulated Baker Street clinic.
Jaw Slimming Injections at Centre for Surgery, London
Jaw slimming injections in summary: Botulinum toxin precisely placed into the masseter muscles on each side of the jaw to produce a slimmer, softer jawline by reducing size over weeks. Performed exclusively by GMC Specialist Register plastic surgeons at Centre for Surgery — not nurses, dentists, or non-specialist doctors. Treatment takes 5 minutes; visible slimming develops over 4–8 weeks and lasts 4–6 months. Also highly effective for bruxism (teeth grinding), jaw clenching, and masseter-related TMJ pain. From £695 for both sides; course of 2 from £1,250. CQC-regulated clinic, 0% APR finance available to status.
Plastic surgeon-led, not nurse-led. The masseter is a deep muscle close to important anatomical structures — the parotid gland, parotid duct, branches of the facial nerve, and the masseteric artery. Injection placement matters: too superficial and the toxin to smile muscles producing asymmetric expression; too deep or in the wrong location and you risk parotid gland involvement or facial nerve effect. Plastic surgeons learn this anatomy in detail because they operate on these structures during facelift surgery. The same surgeon who would perform your facelift, blepharoplasty, or rhinoplasty is the one delivering your jaw treatment. This level of credential is uncommon in London injectables and matters most in revision cases, asymmetric jaw anatomy, patients with previous facelift, or those with concurrent TMJ pathology.
Jaw slimming injections work for two distinct patient groups — those wanting a more refined, less square jawline for cosmetic reasons, and those with bruxism, jaw clenching, or masseter-related jaw pain wanting symptom relief. Both groups are treated using the same protocol, and many patients have both concerns simultaneously.
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What Are Jaw Slimming Injections?
Jaw slimming — also called masseter injections, or non-surgical jaw reduction — use botulinum toxin to shrink the masseter muscles on each side of the jaw. The result is a slimmer, softer jawline contour and (for patients with bruxism or clenching) significantly reduced jaw activity at night and during stress.
The masseter is the muscle that runs from the cheekbone (zygomatic arch) down to the angle of the jaw. It’s one of four chewing muscles, and one of the strongest muscles in the body relative to its size. In some people, the masseter is naturally large; in others, it enlarged habitual clenching, grinding, or chewing — particularly in patients with bruxism, those who chew gum frequently, or those who clench their jaw under stress.
When botulinum toxin is injected into the body of the masseter:
The same injection delivers two different benefits, which often co-exist in the same patient:
A consultation which factors are and which treatment, or combination, is most appropriate.
Benefits of Jaw Slimming Injections
The benefits of masseter injections fall into two — visible jawline change and functional symptom relief. Most patients experience some of both.
Who is Suitable for Jaw Slimming Injections?
Jaw slimming injections are suitable for adults aged 18+ whose jaw width is at least partly muscular, or who have bruxism, jaw clenching, or masseter-related jaw pain. Suitability is confirmed at consultation with the plastic surgeon.
A face-to-face consultation with the plastic is required. The mandatory two-week cooling-off period applies to all elective treatments — you book consultation, then book treatment minimum 14 days later.
Causes of a Wide or Square Jawline
Understanding what’s driving the appearance of your jaw matters because it determines whether masseter slimming will help — or whether a treatment is needed.
The plastic surgeon assesses your jawline by:
If the jaw width is mostly muscular, masseter slimming is the appropriate treatment. If it’s primarily bony, we’ll tell you directly that toxin won’t deliver the change you’re looking for and discuss whether maxillofacial referral or a different approach is more appropriate. We don’t recommend that won’t deliver the result you want.
The Jaw Slimming Injection Procedure
The injection itself takes 5 minutes for both sides. Allow 30–45 minutes total for the appointment including consultation review, photographs, numbing cream application (if requested), and advice.
Each injection is a brief deep pinprick. The masseter is a deep muscle so the needle goes deeper than for facial wrinkle treatment, but the area has relatively few sensitive nerve endings. Most patients rate the discomfort 2–4 out of 10 — slightly more than forehead but very tolerable. Each injection takes a few seconds; both sides completed within 5 minutes.
A follow-up review is included in the treatment cost. At this review:
Aftercare After Jaw Slimming Injections
Recovery in summary: Minimal . Resume work and most normal the same day. Avoid lying flat, heavy exercise, and jaw massage for 4 hours. Avoid alcohol for 24 hours. Mild jaw fatigue with tough foods possible for first 2–3 weeks. Early effects from day 7; slimming from week 4; peak effect at 8–12 weeks.
Contact us on if you experience:
Jaw Slimming Injections for Bruxism, Jaw Clenching, and TMJ Pain
A significant proportion of our masseter injection patients come for the functional benefit rather than the cosmetic one — or for both. This section covers what to expect when the primary goal is symptom relief rather than change.
Bruxism is involuntary grinding of the teeth, at night. It affects an estimated 8–10% of UK adults and can cause:
Masseter botulinum toxin reduces grinding force significantly. Within 2–4 weeks, partner-reported grinding noise reduces or stops. Tooth wear progression slows or halts. Morning typically reduce. The treatment doesn’t cure the brain pattern that causes grinding (the muscles still try to contract; they just can’t contract as strongly), but it neutralises the damaging consequences.
We typically recommend masseter toxin for bruxism patients who have:
daytime clenching is common, often unnoticed by the patient. Symptoms include jaw fatigue at end of day, tension headaches, and visibly enlarged masseters. Masseter toxin reduces the strength of clenching, often providing meaningful relief.
Temporomandibular joint (TMJ) pain has multiple causes — overactivity is one of them. whose TMJ pain is driven primarily by masseter and clenching muscle respond well to masseter toxin. Patients whose TMJ pain is driven by joint disc problems, structural issues, or bite problems need additional dental, maxillofacial, or orthodontic input — masseter toxin alone won’t address the joint problem.
The injection technique is the same as for cosmetic jaw slimming, but dosing may differ slightly:
Masseter toxin works best alongside other appropriate care for bruxism and TMJ:
We work alongside your dentist and any specialists involved — there’s no conflict between masseter toxin and other appropriate care.
Risks and Side Effects of Jaw Slimming Injections
Masseter injections are well-established and considered low-risk when performed by appropriately trained clinicians using correct technique. Most adverse effects are and resolve as the toxin wears off. Surgeon-level placement is the main mitigation against complications.
Most masseter complications come from imprecise placement. Surgeon-level anatomical knowledge minimises:
The treatment is not for:
Jaw Slimming Injection Cost in London — Plastic Surgeon-Led Pricing
Jaw slimming injections at Centre for Surgery are £695 for both sides. A course of 2 sessions (3 months apart) for maximum slimming effect is from £1,250 (saving £140). Pricing reflects the GMC Specialist Register plastic surgeon credential and sits above standard nurse-injector tier in the London market.
For patients combining masseter slimming with other treatments at the same appointment:
Every quote at Centre for Surgery includes:
There are no hidden charges and no per-unit pricing. The price quoted at consultation is the price you pay.
Most London masseter injections are delivered by aesthetic nurses or dentists at £350–£500 per session. Plastic-surgeon-led clinics sit at a different pricing tier because the credential, training time, and accumulated anatomical experience are significantly higher. The masseter is a deep muscle close to the parotid gland, parotid duct, branches of the facial nerve, and the artery — placement matters, and surgeon-level anatomical depth is the primary risk mitigation.
The relevant question isn’t “why does this cost more than the nurse clinic” but “what’s the value of having a plastic surgeon do this rather than a nurse”. For with previous facelift, asymmetric jaw anatomy, revision after problematic treatment elsewhere, or those with TMJ pathology — the difference meaningful.
Masseter injections for are not currently covered by most UK private health insurance, even where the medical indication is clear. Some insurers consider it on a basis with dental specialist referral. We can provide medical documentation for insurance claims if you wish to attempt reimbursement, but most patients self-fund.
For combined treatment plans or course-of-2 protocols, Chrysalis Finance offers payment plans. 0% APR options are available subject to status, with longer terms at variable rates.
Indicative monthly costs at 0% APR over 12 months:
Full finance details are on our , or speak to a patient coordinator on .
Why Choose Centre for Surgery for Jaw Slimming Injections
Masseter injections are sometimes described as a treatment. They are not — at least not when done well. The masseter sits close to important anatomical structures and the consequences of imprecise placement (smile asymmetry, parotid involvement, facial nerve effect) are meaningful. Here’s why patients choose Centre for Surgery.
Every injectable treatment at Centre for Surgery is performed by a plastic surgeon on the GMC Specialist Register — the same surgeon who would perform your facelift, blepharoplasty, or rhinoplasty if you needed it. surgeons train in the detailed of the masseter, parotid gland, facial nerve, and masseteric artery because they operate on these structures during facelift surgery. The same anatomical knowledge directly masseter injection placement. This level of credential is uncommon in London injectables.
Centre for Surgery is a private clinic on Baker Street, London. The same clinical governance standards required of any private hospital apply at our clinic. The injectables market is largely unregulated — CQC regulation is a meaningful filter.
We tell you if your jaw width is muscular (responsive to toxin) or bony (not responsive). Patients with primarily bony jaw width are referred to colleagues for assessment of mandibular angle reduction surgery — we don’t recommend treatment that won’t deliver the result you want. Similarly, patients with significant skin laxity or jowls may be better served by surgical facelift than by slimming alone.
We treat both cosmetic jaw slimming patients and functional bruxism patients with the same protocol. Many patients have both concerns — the same treatment delivers both benefits. We can also coordinate alongside your dentist if you have a night guard, recent dental restoration, or ongoing TMJ management.
We dose conservatively at first treatment with the option to top up at the 4–6 week follow-up review. Too little is easy to add to; too much produces uncomfortable jaw weakness for 4–6 months. Patients wanting maximum slimming have the course-of-2 protocol; patients wanting subtle change or just bruxism control have single sessions.
The most balanced jawline result often combines masseter slimming with jawline filler — the masseter slims the wide muscular component, and filler adds definition and angle. Both are delivered at the same appointment by the same plastic surgeon. We also commonly combine masseter slimming with anti wrinkle injections, dermal fillers, biostimulators, or surgical facelift planning.
We see patients with problematic masseter treatment from elsewhere — asymmetric slimming, smile asymmetry from too-superficial injection, accentuated jowls from too-aggressive treatment without skin assessment. Surgeon-led credential matters in these cases. We are routinely able to assess what was done, plan corrective treatment, and avoid repeating the same problems.
The clinic is at 95–97 Baker Street, Marylebone, London W1U 6RN, a short walk from Baker Street tube station (Jubilee, Metropolitan, Circle, Hammersmith & City, and Bakerloo lines).
A face-to-face consultation with the plastic is required before any treatment.
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Address: 95–97 Baker Street, Marylebone, London W1U 6RN
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Marylebone
London
W1U 6RN
Mon – Sat, 9am – 6pm
Saturday consultations available
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