Masseter Botox in London

Masseter botox London is one of our most requested treatments at PRP London Clinic, addressing both the aesthetic desire for a slimmer jawline and the medical need for relief from teeth grinding and jaw clenching. As a specialist treatment within our anti-wrinkle treatment programme, masseter botulinum toxin injections offer a non-surgical solution for patients experiencing masseter hypertrophy, bruxism, or temporomandibular joint (TMJ) discomfort.

This page is dedicated to jaw slimming botox London and botox for bruxism London — a dual-purpose treatment that reduces the bulk of overactive masseter muscles while alleviating the pain and dental damage associated with chronic teeth grinding. Whether your primary concern is facial contouring or functional jaw relief, our GMC-registered doctors provide a thorough assessment and personalised treatment plan at 33 Cavendish Square, London W1G.

Every jaw botox London consultation and treatment at PRP London Clinic is performed by a GMC-registered doctor with specialist training in facial anatomy. Our team includes Dr Bruno Amendola (GMC: 4346629), who holds an international postgraduate qualification in aesthetic medicine and Save Face accreditation with extensive experience in masseter assessment and treatment; Dr Mohamed Nafei (GMC: 7520509), whose postgraduate training in aesthetic medicine and endocrinology supports a holistic approach to jawline botox London treatment planning; Dr Reem Nouri (GMC: 6149512), who combines general practice expertise with advanced aesthetic training for precise, symmetrical results in face slimming botox London; and Dr Mohammad Akbar (GMC: 5206673), our Founder and Medical Director and Fellow of the Royal College of Surgeons of Edinburgh, whose surgical background ensures the highest clinical standards for every masseter botox London procedure we perform.

Masseter Hypertrophy

The masseter is one of the strongest muscles in the human body, responsible for the closing action of the jaw during chewing. In some individuals, this muscle becomes enlarged — a condition known as masseter hypertrophy — resulting in a widened, square-shaped lower face. Hypertrophy may develop from habitual clenching, bruxism, excessive gum chewing, or genetic predisposition. Masseter botox works by partially relaxing the overactive muscle, allowing it to reduce in bulk over several weeks and producing a slimmer, more tapered jawline without surgery.

Bruxism (Teeth Grinding)

Bruxism botox treatment targets the involuntary grinding or clenching of teeth, which most commonly occurs during sleep. Chronic bruxism can lead to tooth wear, enamel damage, jaw pain, headaches, and disrupted sleep. A systematic review of 9 randomised controlled trials demonstrated significant reductions in pain scores and bruxism events following masseter botulinum toxin injection — with mean pain scores dropping from 7.1 to 0.2 at six months post-treatment and bruxism events reducing from 4.97 per hour to 1.70 per hour.

TMJ Dysfunction

TMJ botox London addresses temporomandibular joint dysfunction, a condition causing pain, clicking, or restricted movement in the jaw joint. While the TMJ itself is not injected, relaxing the masseter muscle reduces the excessive force placed on the joint, alleviating associated pain and tension. Patients presenting with TMJ symptoms receive a thorough assessment to determine whether masseter treatment is appropriate or whether referral for further investigation is warranted.

The Dual Benefit

What makes jaw slimming botox London unique is its dual aesthetic and medical benefit. Patients seeking a more contoured facial profile often discover relief from bruxism symptoms they had normalised, while those presenting with teeth grinding frequently appreciate the cosmetic improvement as the masseter reduces in size. This combined benefit makes masseter treatment one of the most satisfying procedures we offer at PRP London Clinic.

Your masseter botox London appointment begins with a focused consultation. The treating doctor assesses your masseter size, symmetry, bite function, and the extent of any bruxism or TMJ symptoms. You will be asked to clench your jaw so the doctor can palpate the muscle bulk and identify the optimal injection zones.

Treatment involves a series of small injections into each masseter muscle using ultra-fine needles. The number of units varies depending on muscle size, the degree of hypertrophy, and whether the primary goal is aesthetic slimming, bruxism relief, or both. Typical dosing ranges from 25 to 50 units per side, though your doctor will determine the precise amount based on your anatomy. The injections are placed at specific points within the muscle belly to ensure even relaxation and avoid adjacent structures.

The procedure itself takes approximately 15–20 minutes and does not require anaesthesia — most patients describe only a mild pinch sensation. There is no downtime, and you can resume normal activities immediately. Bruxism symptom relief typically begins within 1–2 weeks, while visible jaw slimming results develop gradually over 4–8 weeks as the muscle atrophies from reduced activity.

If you have received masseter botox at another clinic and are dissatisfied with the results, PRP London Clinic offers a correction consultation. Common concerns include asymmetrical jawline reduction, over-treatment leading to excessive hollowing of the lower face, under-treatment with insufficient slimming effect, or functional issues such as difficulty chewing or unexpected changes to your smile.

Correction is assessed on a case-by-case basis. Some issues — such as under-treatment or asymmetry — can be addressed with a targeted supplementary injection. Others, particularly over-treatment, may require waiting for the existing treatment to wear off before retreatment with a revised dosing strategy. Your doctor will provide an honest assessment of what can be achieved. A consultation fee applies regardless of whether correction is possible.

Jaw slimming botox London cost at PRP London Clinic starts from £450. The final price depends on the number of units required, which is determined by the size and strength of your masseter muscles and whether the treatment goal is primarily aesthetic slimming, bruxism relief, or both.

Factors affecting the cost of your masseter botox London treatment include:

• Muscle bulk — larger or more developed masseters require higher unit counts
• Treatment goals — combined aesthetic and medical objectives may require a different dosing approach
• Asymmetry correction — uneven masseter development may require different unit counts on each side
• Maintenance stage — first treatments may require higher doses than subsequent sessions

A detailed quote is provided during your consultation based on your individual treatment plan. All pricing is transparent with no hidden fees. Consultation fees are deducted from the treatment cost if you proceed on the same day.

The safety of botulinum toxin for masseter treatment is supported by clinical evidence. A meta-analysis of 32 randomised controlled trials involving 9,669 patients confirmed an acceptable overall safety profile for cosmetic botulinum toxin, with injection site reactions occurring at similar rates to placebo. Specific to the masseter, a systematic review of 9 randomised controlled trials examining botulinum toxin for bruxism-associated temporomandibular symptoms found significant clinical benefit with a manageable adverse effect profile.

The most commonly reported side effects of masseter botox include:

• Mild bruising or swelling at injection sites (resolves within days)
• Temporary jaw tenderness or a sensation of tightness
• Temporary difficulty with very hard or chewy foods during the first 1–2 weeks
• Cosmetic smile changes — reported in up to 15.4% of patients in one study, typically mild and transient

At PRP London Clinic, all jaw botox London treatments are administered by GMC-registered doctors with detailed knowledge of the complex musculature surrounding the masseter. Precise injection placement minimises the risk of affecting adjacent muscles such as the risorius or zygomaticus, which could otherwise influence smile dynamics. Every patient receives a pre-treatment assessment to identify contraindications and a review appointment at 4–6 weeks.

First 24–48 Hours

• Avoid touching, rubbing, or massaging the jaw area
• Avoid hard, chewy, or tough foods (steak, chewing gum, crusty bread, toffee) for 48 hours
• Do not apply makeup to injection sites for 12 hours
• Avoid strenuous exercise, saunas, steam rooms, and hot baths
• Limit alcohol consumption
• Sleep on your back if possible for the first night

First Two Weeks and Beyond

• Bruxism symptom relief (reduced clenching, less jaw tension) typically begins within 1–2 weeks
• Visible jaw slimming develops gradually over 4–8 weeks as the muscle atrophies
• Avoid dental procedures for 2 weeks
• Do not have facials or facial massages for 2 weeks
• If you wear a night guard for bruxism, continue wearing it until your review appointment — your doctor will advise whether to continue
• Contact the clinic if you experience significant difficulty chewing, marked asymmetry, or any unusual symptoms

Your doctor will provide written aftercare instructions tailored to your specific treatment at the time of your appointment.

Your suitability for masseter botox is determined during your medical consultation. The following conditions are contraindications specific to this treatment:

• Neuromuscular disorders — myasthenia gravis, Lambert-Eaton syndrome, amyotrophic lateral sclerosis
• Pregnancy or breastfeeding — treatment is not administered during pregnancy or lactation
• Allergy or hypersensitivity — known allergy to botulinum toxin or any formulation excipients
• Active skin infection — any infection at the proposed injection site must be fully resolved
• Bleeding disorders — including patients on anticoagulant therapy (discussed on a case-by-case basis)
• Significant structural jaw asymmetry — cases involving bony rather than muscular asymmetry may require surgical assessment rather than injection-based treatment
• Certain medications — aminoglycoside antibiotics, muscle relaxants, or other medications that may interact with botulinum toxin
• Active dental or orthodontic treatment — coordination with your dentist may be required before proceeding

If you are unsure whether any of these apply to you, your consulting doctor will review your full medical history and advise accordingly. All decisions are made with patient safety as the primary consideration.

This page is intended for informational and educational purposes only. The content does not constitute medical advice, diagnosis, or a recommendation for any specific treatment. Certain treatments described involve prescription-only medicines that can only be prescribed by a qualified medical professional following a face-to-face assessment. Individual results vary, and outcomes cannot be guaranteed. All medical treatments carry risks, which will be discussed in full during your consultation. This content was last reviewed on 2 April 2026 by the medical team at PRP London Clinic.

PRP London Clinic is located at 33 Cavendish Square, London W1G 0PW, in the heart of Marylebone — one of London's most established medical districts. Our clinic is a short walk from Oxford Circus (Central, Victoria, and Bakerloo lines), Bond Street (Central and Jubilee lines), and Regent's Park (Bakerloo line). If you are searching for masseter botox London with GMC-registered doctors, convenient central access, and a consultation-led approach, PRP London Clinic provides specialist jaw slimming and bruxism treatment London with thorough assessment, precise treatment, and structured follow-up care.

Take the first step toward a slimmer jawline or relief from teeth grinding. Book a consultation with one of our GMC-registered doctors at PRP London Clinic to receive a personalised assessment for masseter botox London. Whether your goal is aesthetic jaw contouring, bruxism symptom management, or both, our medical team provides expert evaluation and tailored treatment at 33 Cavendish Square.