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Non Surgical Jaw Reduction

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Non-surgical jaw reduction uses small doses of botulinum toxin placed precisely into the masseter muscles to reduce their bulk over 4-8 weeks. The result: a softer, more oval-shaped lower face for patients whose wide jaw is caused by enlarged masseter muscles rather than bone structure or excess fat. The treatment also provides therapeutic relief for bruxism (teeth grinding) and TMJ-related jaw tension, making it useful even for patients with no cosmetic concern.


This is the comprehensive guide to : how they work anatomically, who suits the treatment, what to expect from the procedure and result, and when alternative approaches are more .


The masseter muscle and what enlarges it


The masseter is one of the four chewing muscles. It originates from the zygomatic arch (cheekbone) and inserts into the angle and lower border of the mandible (jawbone). When it contracts, it elevates the jaw — its function in chewing.


The masseter is unusually strong for its size — one of the strongest muscles in the human body by force per cross-sectional area. Like any muscle, it responds to repeated heavy use by hypertrophying (growing larger). Several factors can produce masseter enlargement:


Genetic predisposition. Some individuals naturally have larger masseter muscles regardless of habits — particularly common in certain ethnic backgrounds and family lines.


Bruxism (teeth grinding). Repetitive clenching, especially during sleep, exercises the masseter day and night, producing significant muscle hypertrophy over years.


Chronic gum chewing or hard food . Repeated heavy chewing of gum, ice, hard candy, or particularly tough foods can contribute to .


Jaw clenching from stress. Many patients clench their jaw unconsciously during stress, similar masseter exercise effects.


TMJ disorder. Underlying jaw joint problems can produce compensatory muscle overuse and consequent hypertrophy.


The result of enlarged masseters is a wider, more square-shaped lower face. For some patients this is purely cosmetic . For others, it’s by tension, jaw pain, headaches, or worn tooth surfaces from grinding.


How the treatment works


toxin injected directly into the masseter muscles interrupts the nerve-muscle signal that controls contraction. Over 4-8 weeks, the affected muscle:


The treatment doesn’t paralyse the muscle completely — chewing function is preserved. The dose is to weaken the muscle enough to useful slimming without compromising chewing strength meaningfully.


Typical dose: units per side, depending on muscle size and treatment goal. Conservative dosing produces gradual slimming; higher dosing produces more pronounced effect but with more reduction in chewing strength.


Number of injection points: typically 3-5 per side, distributed across the body of the muscle. This ensures even distribution of effect rather than localised weakness.


What to expect from the procedure


Consultation. Assessment of jaw width, masseter size (palpation while you clench), and identification of contributing . Photos taken for comparison.


Preparation. Skin cleansed thoroughly. Topical anaesthetic isn’t usually needed — the are quick and well-tolerated.


The injection.


Immediate effects. Mild redness at injection points, occasional small bruise. No immediate effect on the muscle itself — the toxin takes time to act.


Aftercare.


For injectables aftercare context, see our .


Timeline of results


Days 1-7: no visible change. The toxin is acting on the nerve-muscle signal but the muscle hasn’t shrunk yet.


Weeks 2-4: initial muscle weakening becomes noticeable. Some patients report less jaw tension and reduced grinding/clenching habits.


Weeks 4-8: the muscle begins visibly shrinking as it atrophies from use. Lower face starts to look narrower.


Month 2-3: maximum slimming effect visible. The lower face appears more oval-shaped, cheekbones often look more defined by contrast.


Months 3-6: stable result. Patients enjoy the slimmer appearance and ongoing reduction in jaw tension.


Months 6-9: effect begins to fade as muscle activity gradually . Maintenance treatment recommended.


The slimming effect is gradual and often goes unnoticed by family and friends — they may comment that you look refreshed without identifying what’s changed. This subtlety is part of why the treatment is popular: it produces meaningful change without obvious "work."


Who is a good candidate?


The ideal candidate has:


Less suitable candidates:


For more on the broader question of jawline aesthetics, see our guide on and our reference.


The therapeutic benefits beyond cosmetic


For many patients, jaw slimming injections provide significant relief from:


Bruxism (teeth grinding). The weakened muscle can’t grind as forcefully. with worn tooth surfaces from years of grinding often see substantial improvement, documented by their dentist at routine check-ups.


Jaw tension and pain. Chronic masseter tightness produces deep jaw aching that responds well to muscle relaxation.


Tension . Some headaches are driven by chronic masseter and temporalis muscle tension. Treatment can produce meaningful headache reduction.


TMJ discomfort. While not a primary treatment for TMJ disorder, the masseter can reduce TMJ-related pain in many patients.


Dental wear protection. For patients who grind their teeth, remaining tooth from further wear is valuable beyond any consideration.


These therapeutic benefits sometimes prompt patients to seek the treatment for non-cosmetic reasons, with the slimming effect being a welcome additional benefit rather than the primary goal.


Combining with other treatments


Jaw slimming injections often well with other facial treatments:


Jaw slimming + Cheek Fillers filler. Reducing lower-face width while enhancing cheekbone definition produces dramatic sculpting. See our guide on .


Jaw + chin filler. Sharper, more defined chin combined with narrower jaw produces refined lower-face proportion.


Jaw slimming + buccal fat removal. For patients with both wide jaw and full lower cheeks, combined treatment addresses both. See our guide on for the broader thinking.


Jaw + anti-wrinkle treatment elsewhere. Often performed in the same session as forehead or glabella treatment for comprehensive injectable refinement.


For the broader non-surgical rejuvenation context, see our .


Cost


Jaw slimming injections at Centre for Surgery are priced per session:


Over a year, total cost is typically £400-£700 depending on the dose and maintenance frequency.


, 0% APR, are available.


A useful comparison: the cost is substantially less than the surgical alternatives (mandibular contouring or masseter reduction surgery), with much faster recovery and no permanent change.


Risks and considerations


Common (mild and self-limiting):


Less common:


Rare:


injection technique substantially reduces these risks. A consultation your specific risk profile based on your and goals.


Common questions


Yes — chewing function is preserved. The treatment reduces masseter bulk and weakens excessive force but doesn’t eliminate the muscle’s function. Most patients notice no change in their ability to eat normally.


The slimming develops gradually over 4-8 weeks. muscle relaxation is felt within 2 weeks; visible starts at week 4 and peaks around weeks 8-12.


Not when the treatment is conservatively dosed in appropriate candidates. Patients with already-slim faces are typically advised against the because of this risk. The slimming should look like refinement, not depletion.


Yes — biting force is preserved. Some patients notice the slight reduction in chewing strength when eating particularly tough foods (chewy meat, hard candy), but routine eating is entirely normal.


Typically 6-9 months. Many patients find that with regular maintenance treatment over years, the underlying muscle stays relatively reduced even between treatments, sometimes allowing longer intervals.


Often yes — particularly nighttime grinding. The muscle can’t grind as forcefully. Tooth wear protection is a significant therapeutic benefit. Discuss with your dentist as well — combining the treatment with a night guard can be even more effective.


Yes, though more . Men typically prefer to retain some jaw width for masculine proportions while still benefiting from reduced muscle tension and bruxism relief. The treatment plan is adjusted accordingly.


The toxin can’t be reversed (unlike filler, which can be dissolved). The effect wears off naturally over 6-9 months as muscle activity returns. If you don’t like the result, simply discontinuing will allow the muscle to gradually regain its previous size.


Mandibular contouring surgery bone from the jaw angle — addressing wide jaw caused by bone structure rather than muscle. It’s more invasive, more permanent, and addresses a different cause. Jaw slimming injections only affect muscle. The right treatment depends on whether your jaw width comes from bone or muscle, which is established at consultation.


Most patients clearly see the change in their own face. Friends and family often notice the patient looks "refreshed" or "thinner" without identifying what specifically changed. The is part of why the treatment is popular.


Centre for Surgery · CQC-regulated · GMC specialist-registered surgeons · · · ·


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Centre for Surgery is a CQC-regulated private hospital on London’s Baker Street, delivering plastic and cosmetic surgery through GMC-registered specialist surgeons. Our expertise spans facial procedures including and , , for men, and body contouring procedures such as and . Patient safety, surgical excellence and natural-looking results sit at the heart of everything we do.


Centre for Surgery is a CQC-regulated private hospital on London’s iconic , offering plastic and cosmetic surgery led by GMC-registered consultant surgeons.




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