Last updated November 2021

What is bruxism?

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 desirable, 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. Slimming 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.

How can I slim my jawline non-surgically?

By injecting anti-wrinkle injections or muscle relaxants into the main jaw muscles that causes the bulk (the masseter muscles), the squareness of the jaw can be reduced significantly. The symptoms of bruxism will also be reduced. The procedure has virtually no downtime, it 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 for jawline slimming 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.

Benefits of masseter botox

Slimming injections in the masseter muscle can result in both aesthetic and medical benefits. These include:

  • The management of teeth grinding and bruxism
  • Reduction of jaw tension and pain
  • The relief of headaches if they are related to jaw pain
  • Contouring of the face shape
  • Facial slimming and jawline slimming

Are there any side effects/risks?

There is a minimal amount of downtime associated with this procedure, but in the days following you may experience mild pain or swelling, bruising or redness, which can be treated by using a cold compress or taking over-the-counter pain relief.

Who is unsuitable for masseter treatment?

Anyone who is pregnant or breastfeeding should not undergo jawline slimming treatments. If you have any significant allergies, muscular disorders or severe scarring you may not be the right patient for masseter botox, and you should discuss these with a doctor before deciding to proceed.

What to Expect

Before treatment

Prior to the procedure, you will have a consultation with a doctor in our clinic who will discuss your goals and concerns and examine your face, jaw and chin to determine how many injections you will need.

During treatment

The actual treatment will take place in a doctor’s office or clinic, not at a hospital.

The doctor will clean your face and possibly apply a local anaesthetic. They will prepare a syringe with the botulinum toxin and then insert the needle into your masseter muscle. They may repeat the process on the other side.

The procedure will take around 15 minutes.

After treatment

This particular procedure requires no recovery time, so you can return to normal activities. However you should avoid exercising or putting any pressure on the injection site for 24 hours afterwards.

Before and After Jawline Slimming

Case Study 1

This patient presented to the 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 seen in the after photo was taken 3 months later at a follow up appointment. There was a dramatic reduction of volume in the jawline in this case. The result lasted 6 months.


Case Study 2

This patient presented to the Victorian Cosmetic Institute with concerns about a square 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.

botox melbourne

Case Study 3

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

jawline slimming with botox before and after

Case Study 4

Video case study – facial slimming with anti-wrinkle injections and fillers

This patient had concerns with the width of her face and wanted to achieve a slim look. 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.

Case Study 5

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

masseter botox jawline slimming


How much does facial slimming cost?

In your consultation, the clinician will discuss the cost of your treatment with you as the price for facial slimming injections is normally determined per unit of injection. The factors that determine dosage include the muscle strength of your jawline and your desired outcome.

Prices start from $19.50 for 1 to 30 units, with an estimate of 20 to 100 units, and an average of 50 units required.

For our current price list click here

How many units of anti-wrinkle injections do you need for a masseter?

Usually, 20-50 units of slimming injections are required in this area per side (total of 40 to 100 units), but this may vary on a case by case basis.

What are the masseters?

The masseter muscles are the main jaw muscles in the lower face, used for chewing and opening and closing your mouth. Larger masseters can be caused by teeth clenching and jaw grinding, or they can be due to genetics.

How long does it take to see results?

You will be able to see the results of your slimming treatments after 1-2 weeks.

How long does facial slimming last?

The results should last for 4-8 months. You will need to have the treatments consistently in order to maintain the contouring of the jawline and face.

When should I have my next treatment for the masseters?

You may need to have your treatments periodically, when the previous treatment has faded. There should be at least a few months in-between each appointment.

How painful are facial slimming injections?

There should be a minimal amount of pain associated with face slimming and contouring treatments.

Why choose the Victorian Cosmetic Institute?

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. Speak with one of our doctors about Non Surgical Jawline Slimming and Facial Slimming Treatments

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 contact or phone us directly on 1300 863 824.