Non Surgical Jawline Slimming and Facial Slimming Treatments

Anti-wrinkle injections can help to relax the masseter muscle to non-surgically slim the face and jawline.

Article medically reviewed by Dr. Gavin Chan (MBBS, cosmetic physician, liposuctionist)

Dr. Gavin Chan

Templestowe Lower and Berwick Clinics

Dr. Gavin Chan has a background in intensive care, anaesthesia, and emergency medicine. Since 2004, Dr. Chan has provided cosmetic procedures, including anti-wrinkle injections, dermal fillers, liposuction, fat transfer, skin needling, and laser treatments. He is a doctor trainer for various dermal fillers and anti-wrinkle injections.
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What is bruxism? How can I slim my jawline non-surgically?

Bruxism is a condition characterised by teeth grinding and excessive clenching of the jaw. It usually occurs at night during sleep and can have consequences such as the blunting of teeth, headaches, temporomandibular joint (TMJ) problems, and an increase in the size of the masseter (chewing) muscles that result in a widening of the jawline and a square appearance of the face. A square jaw is a feature that may not be always be desired, especially in females. It can be due to bruxism or in some cases it can be a genetic trait. Hypertrophy (increased size) of the masseter muscle can be treated with anti-wrinkle injections or muscle relaxing injections. This is often sought out by those wanting to achieve facial slimming or jawline slimming. Simming the jawline can help to convert a square shaped face into an ‘upside down triangle’ shape, and this is usually a more youthful and attractive facial shape.

By injecting anti-wrinkle injections or muscle relaxing injections into the main muscle that causes the bulk (the masseter muscle), the squareness of the jaw can be reduced significantly, and bruxism reduced. The procedure has virtually no downtime and starts to work in 1 week and lasts for about 4 to 8 months. Usually, 20-50 units of anti-wrinkle injections are required in this area per side (total of 40 to 100 units). The result is usually aesthetically pleasing for those with hypertrophy or enlargement of the masseter muscle. Furthermore, there is often a significant symptomatic relief of jaw pain, headaches, clenching and jaw tension.

The temporalis muscle, which is felt over the temples when clenching the jaw, is another target for anti-wrinkle injections or muscle relaxing injections. The temporalis muscle works in conjunction with the masseter muscles to help with chewing and closing the jaw. Although treatment of the temporalis muscle is less commonly sought after for cosmetic purposes, treatment with muscle relaxing injections can help reduce headaches caused by excess tension in this muscle.

Another option to slim the jawline in some cases is to have liposuction over the parts of the lower face and jawline. This is only suitable for those who have an excess of fat (and not muscle) in these areas. For more information on liposuction, click here.

For estimate units and costs visit the Cosmetic consultation and treatments pricing page.

Case Study 1

This patient presents to Victorian Cosmetic Institute with concerns about the squareness and wideness of her face.

Although she did not complain of teeth grinding problems, she had a very strong jaw (masseter) muscle. 45 units of muscle relaxant (anti-wrinkle injection) were injected into each side, and the result see in the after photo was taken 3 months later at a follow up appointment. There was a dramatic change in this case. The result lasted 6 months.



This patient presented to Victorian Cosmetic Institute with concerns about the squareness of her jawline. The result below was achieved by injecting anti-wrinkle injections into the muscles that are responsible for chewing (along the jawline, adjacent to the ears – you can feel these muscles on yourself when you clench your jaw).
She was injected with a total of 25 units of muscle relaxant (anti-wrinkle injection) to her right side and 35 units to her left side. The post photo was taken 3 weeks after the bruxism treatment, and a noticeable slimming of the jawline/face is apparent.


This patient presented to Victorian Cosmetic Institute for jawline slimming. She had anti-wrinkle to each of her masseter muscles on the sides of her jaw. Using anti-wrinkle relaxes the muscles reducing volume in the jawline. This image has not been photoshopped, there was no surgery performed, only anti-wrinkle injections used in the jawline.

Masseters before and after

This patient has had concerns with the width of her face, and using a combination of anti-wrinkle injections to her masseter muscle, as well as dermal fillers to help proportion the face, she has achieved a slimmer look without the need for surgery.

masseter botox jawline slimming
Treatment with a muscle relaxant to the masseter muscles.


This patient presents with clenching and jaw tension, and had muscle relaxant treatment to her masseter muscle. The after photo on the right shows her result approximately 2 months later.

The Cosmetic Doctors and Cosmetic Nurses at Victorian Cosmetic Institute specialise in non-surgical treatments like jawline slimming. It is a procedure that is commonly performed at our clinics. Our doctors are highly experienced in the procedure and should be able to give you the best advice and treatment possible.

Making that first phone call can be a confronting task – many of our patients have preferred filling out our online enquiry form. 

Otherwise, you can phone us directly on 1300 863 824.

For estimate units and costs visit the Cosmetic consultation and treatments pricing page.


Dr. Gavin Chan
Dr. Gavin Chan

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