Masseter reduction

Face slimming  injection

Summary Of  Your Treatment

Procedure Time

30 minutes estimated

Back To Work

Immediate estimated


No anaesthetic necessary

Full Recovery

24 hours estimated

Duration Of Results

3-4 months *



Also known as Masseter Treatment, face slimming injection is a non-surgical technique to reduce a square jawline to create a more oval, softer face shape.


Grinding of the teeth at night or excessive chewing of gum causes over-activity of the masseter (chewing) muscle which in some cases can cause muscles to become enlarged, making the jaw appear wide and square.

Muscle relaxant into the masseter muscle is ideal for patients who are grinding, clenching, and wearing out their teeth and need a lot of dental work, for patients who have frequent tension or migraine headaches, and for patients who do not like the shape of their face because of square or thick jawline and who want to appear more feminine.

Frequently asked questions

What happens during treatment?

The procedure takes about 5-10 minutes. Muscle relaxant is injected into the enlarged muscle using a fine short needle. The muscle is weakened and will reduce in size creating a softer rounded appearance of the jaw line. Post treatment, the area may have some slight redness and swelling, which normally resolves within two hours. The treatment normally starts to take effect after 4 to 14 days, but this may vary slightly with some individuals. Some patients require a second appointment after 12 weeks and following this the full effects will normally last between 3 to 4 months.

Are there any side effects?

Side effects of this treatment are rare. Most people find that the injection causes only mild discomfort. Immediately after the injection there may be mild swelling, which usually subsides in 48 hours. In extremely rare cases patients have developed an allergy to the treatment, while others have shown resistance, i.e. it causes little or no effect on the treated muscles. If you are pregnant or breastfeeding, treatment is not recommended.

When will results be seen following face slimming injection?

Botulinum toxin starts to be effective in 5 – 7 days reaching a peak at 14 days. Most patients notice a softening of the masseter muscles at 2 weeks and improvement in facial shape / square jaw at 4 – 6 weeks.

How long will the result of face slimming treatment last?

Most improvement will last for approximately 3 months after initial treatment. In order to achieve the ideal result it is recommended to repeat the treatment every 3 months for 3 – 5 treatments. After 12 – 18 months it is necessary then to maintain the improvement with additional treatments every 6 – 12 months.