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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 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 appropriate.

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 the jaw — its primary 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 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 — common in certain ethnic backgrounds and family lines.

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

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

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

TMJ . 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 concern. For others, it’s accompanied by tension, jaw pain, headaches, or worn tooth surfaces from .

How the treatment works

Botulinum 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 calibrated 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, across the body of the muscle. This ensures even distribution of effect rather than localised .

What to expect from the procedure

Consultation [https://www.alphalabsuk.co.uk/]. Assessment of jaw width, masseter size (palpation while you clench), and identification of contributing factors. Photos taken for comparison.

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

The injection.

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

Aftercare.

For broader 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 becomes . Some patients report less jaw tension and reduced grinding/ habits.

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

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

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

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

The slimming effect is gradual and often goes 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 . Patients with worn tooth surfaces from years of grinding often see substantial improvement, sometimes documented by their dentist at routine check-ups.

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

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

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

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

These therapeutic benefits sometimes prompt 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 combine well with other facial treatments:

Jaw slimming + cheek filler. Reducing lower-face width while enhancing cheekbone definition produces dramatic overall 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 slimming + anti-wrinkle treatment elsewhere. Often performed in the same session as forehead or glabella treatment for comprehensive injectable .

For the broader 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 frequency.

, including 0% APR, are available.

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

Risks and considerations

Common (mild and self-limiting):

Less common:

Rare:

Experienced injection technique substantially reduces these risks. A thorough consultation discusses your risk profile based on your anatomy and goals.

Common questions

Yes — chewing function is preserved. The treatment reduces masseter bulk and weakens force but doesn’t eliminate the muscle’s function. Most 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 slimming 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 treatment 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 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 reduced even between treatments, sometimes allowing longer intervals.

Often yes — particularly nighttime grinding. The weakened muscle can’t grind as . 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 conservatively. Men typically prefer to retain some jaw width for proportions while still benefiting from reduced muscle tension and bruxism relief. The treatment plan is adjusted accordingly.

The toxin can’t be actively 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 treatment will allow the muscle to gradually regain its previous size.

Mandibular contouring surgery removes bone from the jaw angle — addressing wide jaw caused by bone rather than muscle. It’s more invasive, more permanent, and a different cause. Jaw slimming 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. and family often notice the patient looks "refreshed" or "thinner" without identifying what specifically changed. The subtlety is part of why the treatment is popular.

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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 . Our expertise spans facial procedures including and , , for men, and body contouring procedures such as and . Patient safety, surgical excellence and 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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