Injectable Treatment

Jawline Slimming

Jawline slimming in London relaxes the masseter muscle to ease the jaw pain, headaches and tooth wear caused by clenching and grinding, while softening a heavy, squared lower face.

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Consultation room at UNTIL Marylebone where Dr Harriet treats jaw clenching

The short answer

What jawline slimming is

Jawline slimming with botulinum toxin can also be used to improve the symptoms of teeth grinding and clenching, a condition known as bruxism. Bruxism can lead to several issues, including dental problems, jaw pain, headaches, and even a more prominent masseter muscle.

The masseter is one of the primary muscles responsible for clenching the jaw. Treatment temporarily relaxes the muscle, reducing the force of clenching and grinding. The symptoms ease as a direct result, and because a less active muscle gradually reduces in bulk, the jawline slims at the same time. Most patients come to Dr Harriet for the first and welcome the second.

What to expect during and after your session

Treatment timeAround 15 minutes
Muscle relaxesWithin the first week
Full effect atTwo weeks
Results lastAround six months
Slimming visibleFrom 6 to 8 weeks
DowntimeNone to speak of
Related concernTeeth grinding

Bright clinic interior at UNTIL Marylebone, where Dr Harriet holds clinic

Why Dr Harriet

Treated for the pain, slimmer as a consequence

Reduces the force of jaw clenching and grinding
Eases jaw pain caused by overworked masseter muscles
Reduces the tension headaches that come with constant muscle contraction
Protects teeth against wear, fractures and damage to dental restorations
Softens an overdeveloped masseter and squared jawline
Effect typically lasts around six months

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What can be treated?

Treatment reduces the force of clenching. It does not stop the habit itself, so your dentist may still recommend a guard for overnight protection alongside it.

Teeth grinding and jaw clenching
Jaw pain from an overworked masseter
Tension headaches from constant muscle contraction
Tooth wear, fractures and damaged restorations
A heavy, squared lower face

Treatment areas

Lower face

Masseter, both sides
Jaw angle

Assessed alongside

Temples
Chin
Dental history

Patient journey

What to expect from jawline slimming

Consultation & preparation

Avoid alcohol for 24 hours and ibuprofen, aspirin, vitamin E and fish oil for 48 hours beforehand where it is safe to stop them. Bring details of any dental treatment or mouth guard you currently use, since Dr Harriet will factor this into the plan.

During treatment

How does treatment help bruxism?

Treatment works by temporarily relaxing the muscles into which it’s injected. The treatment is administered to the masseter muscle, which is one of the primary muscles responsible for clenching the jaw. By weakening the masseter muscle, it can reduce the force of jaw clenching and grinding, which can help alleviate the symptoms associated. That reduction in force is what relieves the symptoms, rather than any effect on the underlying habit itself.

Which symptoms improve?

By reducing the intensity of jaw clenching and grinding, treatment can alleviate several related symptoms. Jaw pain from clenching masseter muscles. Headaches, since many people with bruxism experience tension headaches due to the constant muscle contractions. Dental issues including tooth wear, fractures and damage to dental restorations: by reducing the pressure on the teeth, treatment can protect against some of these issues. And an enlarged masseter muscle, an overdeveloped masseter which contributes to a more square jawline, where treatment can also contribute to jawline slimming.

How long does it last and how often should I treat?

Treatment typically lasts for about six months. Periodic re-treatment may be required to maintain symptom relief, and having regular treatments for the first two years helps to slim the masseter and give longer-lasting effects, because a muscle that is repeatedly under-used gradually reduces in bulk. Many patients then find they can extend the interval.

Who should give this treatment?

It’s important that this treatment is administered by a qualified healthcare professional. They will assess your specific condition and determine the appropriate dosage and injection sites to ensure the best results and minimise side effects. Dr Harriet is a GMC-registered doctor and assesses every patient at consultation before treatment.

Aftercare

Stay upright for four hours and avoid rubbing or massaging the jaw. Skip strenuous exercise, alcohol, saunas and steam rooms for 24 hours. Chewing may feel less powerful for the first fortnight. Symptom relief builds to full effect by around two weeks.

Pricing

Jawline slimming prices in London

The price covers both sides, your consultation and written aftercare. Periodic re-treatment is usually needed to hold the symptom relief, and regular treatment across the first two years is what produces the longer-lasting slimming.

Anti-wrinkle treatments

Jawline slimming, masseter injections Both sides treated

£300

Booking

New patient deposit Redeemable against the cost of your treatment

£50

The £50 new patient deposit is redeemable against the cost of your treatment. Prices are reviewed periodically. Treatment follows a face-to-face consultation and only goes ahead where it is clinically appropriate. Individual results vary.

Boundaries of practice

What's not treated

Good practice means saying no when indicated:

Pregnancy or breastfeeding
Known hypersensitivity to botulinum toxin or any component of the product
Active skin infection at the proposed injection site
Neuromuscular disorders such as myasthenia gravis or Lambert-Eaton syndrome
Current treatment with aminoglycoside antibiotics

Written and medically reviewed by Dr Harriet Turnbull, Aesthetic Doctor and GP: BMBS (Hons), MRCGP · MHRA: botulinum toxin type A is a prescription-only medicine in the UK.

FAQ

Jawline slimming FAQs

Will jawline slimming stop me chewing normally?

No. The dose reduces the force of clenching rather than disabling the muscle, and you keep normal function for eating and speaking. Some patients notice their jaw feels less powerful for the first couple of weeks, particularly with hard or chewy food, and this settles as the effect balances out.

How quickly will my jaw pain improve?

The muscle begins to relax within the first week, and most patients notice a reduction in jaw pain and morning headaches from around two weeks. The full effect settles by day fourteen. If your symptoms have been long-standing, the improvement often continues to build over the first month.

How much will my jawline actually slim?

That depends on how overdeveloped the masseter is to begin with. Visible slimming usually appears from around six to eight weeks as the under-used muscle reduces in bulk, and it becomes more marked with regular treatment across the first two years. Dr Harriet will set a realistic expectation at consultation.

Do I still need a mouth guard?

Possibly. Treatment reduces the force of grinding but does not stop the habit, so your dentist may still recommend a guard for overnight protection. Dr Harriet will ask about your dental history at consultation and is happy for you to coordinate with your dentist on the combined approach.

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Dr Harriet Clinics • 1 Orchard Street, UNTIL Marylebone, London W1H 6HJ

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Appointments typically available within 1–2 weeks