Jaw Slimming Injections

Jaw slimming injections by GMC 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: toxin precisely placed into the masseter muscles on each side of the jaw to produce a slimmer, softer jawline by reducing masseter size over weeks. Performed exclusively by GMC Register plastic surgeons at Centre for Surgery — not nurses, dentists, or non-specialist doctors. Treatment takes 5 minutes; visible 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 subject to status.

Plastic surgeon-led, not nurse-led. The masseter is a deep muscle close to important anatomical structures — the parotid gland, parotid duct, of the facial nerve, and the masseteric artery. Injection placement matters: too superficial and the toxin diffuses 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 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 slimming 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 reasons, and those with bruxism, jaw clenching, or jaw pain wanting relief. Both groups are treated using the same protocol, and many patients have both concerns simultaneously.

Related content at Centre for Surgery:

What Are Jaw Slimming Injections?

Jaw slimming — also called masseter injections, or non-surgical jaw reduction — use botulinum toxin to shrink the 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 becomes enlarged through 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 establishes which factors are present and which treatment, or combination, is most appropriate.

Benefits of Jaw Slimming Injections

The benefits of masseter injections fall into two categories — visible jawline change and 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 face-to-face consultation with the plastic surgeon.

A face-to-face consultation with the plastic surgeon is required. The mandatory two-week cooling-off period applies to all elective treatments — you book consultation, then book 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 will help — or a different treatment is needed.

The plastic surgeon assesses your jawline by:

If the jaw width is mostly muscular, masseter slimming is the treatment. If it’s primarily bony, we’ll tell you directly that toxin won’t deliver the change you’re looking for and discuss maxillofacial referral or a different approach is more appropriate. We don’t recommend treatment 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 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 treatment, but the area has 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 downtime. Resume work and most normal activities 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; visible 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 proportion of our masseter injection patients come for the benefit rather than the cosmetic one — or for both. This section covers what to expect when the primary goal is symptom relief rather than jawline change.

Bruxism is involuntary of the teeth, typically at night. It affects an 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. headaches typically reduce. The 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:

Stress-related daytime is common, often unnoticed by the . 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 — masseter overactivity is one of them. Patients whose TMJ pain is driven primarily by masseter and clenching muscle tension typically 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 — toxin alone won’t address the underlying 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 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 temporary and 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 appropriate 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). reflects the GMC 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. 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 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 patients with previous facelift, asymmetric jaw anatomy, revision after problematic treatment elsewhere, or those with concurrent TMJ pathology — the difference becomes meaningful.

Masseter injections for bruxism are not currently covered by most UK private health insurance, even where the indication is clear. Some insurers consider it on a case-by-case 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 are sometimes described as a routine . 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 .

Every treatment at Centre for Surgery is performed by a plastic surgeon on the GMC Register — the same surgeon who would perform your facelift, blepharoplasty, or rhinoplasty if you needed it. Plastic surgeons train in the detailed anatomy 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 directly if your jaw width is muscular (responsive to toxin) or bony (not responsive). Patients with primarily bony jaw width are referred to maxillofacial 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 masseter slimming alone.

We treat both cosmetic jaw 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 with the option to top up at the 4–6 week 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 surgeon. We also commonly combine masseter slimming with anti wrinkle injections, dermal fillers, biostimulators, or surgical facelift planning.

We see patients with problematic masseter from elsewhere — asymmetric slimming, smile asymmetry from too-superficial injection, 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 OnabotulinumtoxinAAbobotulinumtoxinAIncobotulinumtoxinAPrabotulinumtoxinALetibotulinumtoxinARimabotulinumtoxinBHyaluronic Acid FillersCalcium Hydroxylapatite FillersPoly-L-lactic Acid FillersPolymethylmethacrylate FillersAutologous Fat GraftingForehead Lines TreatmentGlabellar Frown Lines TreatmentCrow's Feet TreatmentBunny Lines TreatmentChemical Brow LiftLip FlipGummy Smile CorrectionMasseter ReductionJaw SlimmingDimpled Chin SmoothingCobblestone Chin SmoothingNefertiti Neck LiftMicro-BotoxMesotoxHyperhidrosis TreatmentChronic Migraine ReliefBruxism TreatmentTMJ TreatmentCervical Dystonia TreatmentNeck Spasm TreatmentBlepharospasm TreatmentLip AugmentationLip ContouringCheekbone EnhancementTear Trough FillersNasolabial Fold SofteningMarionette Line FillersLiquid RhinoplastyNon-Surgical Nose JobJawline ContouringJawline DefinitionChin AugmentationTemple VolumisingHand RejuvenationAcne Scar Subcision Filling).

A face-to-face consultation with the plastic is required before any .

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Address: 95–97 Baker Street, Marylebone, London W1U 6RN

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Finance are available from , including 0% APR, subject to status.

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