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Masseter Botox jawline treatment in london clinic

Masseter Botox for jawline slimming

A wide jaw can be caused by overdevelopment of the masseter (chewing) muscle. Botox treatment can relax this muscle, creating a slimmer, softer look to the jaw

  • Doctor-led treatment
  • Temporary and non surgical
  • Minimal downtime

Introduction to Masseter Botox for jawline slimming

A wide, square jaw is often associated with a masculine face. Women with this face shape may feel self-conscious about their appearance, and want a softer, slimmer, more feminine jawline. When a wide jaw is caused by an overactive masseter muscle (the one used for chewing), this can be treated with Botox


Masseter Botox treatment temporarily relaxes and shrinks the masseter muscle, creating a softer, slimmer, less square look to the jaw. It offers an excellent non-surgical way to reshape and refine the lower face in a very natural looking way.


The PHI Clinic offers London’s best masseter Botox treatments for jawline slimming. This is a quick, safe and comfortable treatment, performed by our highly-skilled team.

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Masseter Botox for jawline slimming: what you need to know

Botox offers a safe, quick and effective way to slim down a jaw that has been widened by an overactive masseter muscle. Suitable candidates can expect to see a slimmer jawline and a softer, more heart-shaped face. 


Relief from physical pain caused by excessive chewing or grinding is an additional benefit from Botox treatment. It temporarily relaxes the muscle responsible for the pain, treating the problem at source.

This treatment involves injecting the masseter muscle with small amounts of Botox, a licensed botulinum toxin type A product. While Botox is best known as an anti-wrinkle treatment for concerns such as frown lines and crow’s feet, it is also a safe, clinically proven alternative to invasive jawline surgery. Botox temporarily relaxes the overactive masseter muscle to achieve a slimmer, softer silhouette to the jaw.

masseter jaw slimming treatment

When can I expect to see results from my jawline slimming treatment

Masseter Botox treatment takes approximately 20 minutes, and gives results that last up to four months. We recommend that you have regular top-up sessions to maintain your slimmer, more refined jawline.


We pride ourselves on our natural looking results, and exclusively use Botox, manufactured by Allergan Aesthetics, to achieve these. 

Our expertise

Our unparalleled expertise enables us to offer the best masseter Botox treatments in London. The PHI Clinic team is led by Dr Tapan Patel, holder of The Aesthetics Award 2023 for Outstanding Achievement in Medical Aesthetics, and a global trainer for Allergan Aesthetics, the manufacturer of Botox. 


To ensure a consistent level of care, safety and effective results throughout, Dr Tapan has hand selected his incredible team of experts. The team receive regular internal and external training by Tapan and leading global experts, making PHI Clinic the reputable Harley Street clinic that it is today. 

We are proud to have outstanding satisfaction rates with our masseter Botox patients. Patients feel more confident about their appearance and are delighted to have achieved such remarkable results in a quick, safe and minimally invasive way.

Dr Tapan Patel Best Botox Doctor London

Get slimmer jawline

Injecting Botox into the masseter muscle dramatically slims and softens a square jawline, reducing a heavy-set appearance and creating a more feminine look to the jaw. Masseter Botox treatment can also have physical benefits such as stopping the facial pain caused by teeth grinding.

Some people have a naturally square jaw, while others develop it over time through overuse of their masseter muscle. The masseter muscle connects the lower jaw to the cheeks, and is one of several facial muscles used for chewing. It can commonly become enlarged by a condition called bruxism, also known as tooth grinding or tooth clenching. Excessive gum chewing can also bulk up the masseter muscle and widen the jaw

An overdeveloped masseter muscle can dramatically change the appearance of the lower half of the face, which can affect self-confidence. Our specialists at PHI Clinic are able to use Botox to undo the effects of an overactive masseter. The treatment takes around 20 minutes, and results last 3-4 months. 

To ensure that masseter Botox is an appropriate jawline slimming treatment, each patient is carefully assessed at a consultation by one of PHI Clinic’s highly-trained specialists. In some cases, a wide jawline is caused by bone shape rather than an overactive masseter muscle. If this is the case, other treatment options may be more effective for jawline reshaping. This will all be taken into consideration and explained during a consultation. 


Patient satisfaction and safety are always our top priorities. We would only recommend a masseter Botox treatment when we feel it will deliver the excellent results our clients expect.

Safe and effective treatment

Your safety is our top priority and making our patients feel welcomed and reassured when entering PHI Clinic. To ensure maximum standard of patient care, all of our treatments are only ever carried out by our experienced and highly qualified team, who receive regular in-house and external training from industry experts. 

At PHI Clinic we do not offer same day treatment as initial consultation to ensure patients have time to reflect on their bespoke treatment plan before choosing to proceed. 

inside PHI Clinic London

Masseter Botox frequently asked questions


PHI Clinic
102 Harley Street,
W1G 7JB,
United Kingdom

Tel: +44 7883 317963

Opening Hours

Monday & Tuesday - 9:30am to 6:00pm
Wednesday & Thursday - 9:30am to 8:00pm
Friday - 9:30am to 5:30pm
Saturday & Sunday - Closed

Opening times can change, if your appointment is outside of these times please contact the clinic for confirmation.