The masseter muscle is the muscle which runs along your jawline near the ear. You can feel if you clench your jaw tightly. It is used to move your lower jaw up and down and side to side.

Some people have overdeveloped masseter muscles, which can present as a wide, square jawline, teeth grinding (bruxism) and jaw pain.

If your primary concerns are of a cosmetic nature, an experienced, medically qualified aesthetic practitioner will be able to offer an appropriate treatment.

However, if jaw pain (e.g TMJ) or teeth grinding are your main concern, you should see your GP or your dentist first to rule out other problems and to explore other treatment options.