Masseter toxin is a cosmetic treatment that involves injecting botulinum toxin, commonly known as Botox, into the masseter muscle, which is located in the jawline, to reduce the size of the muscle and achieve a more slender and contoured appearance. The treatment works by temporarily paralyzing the muscle, which reduces the amount of jaw clenching and teeth grinding, and can also help to alleviate symptoms of jaw pain and headaches caused by temporomandibular joint (TMJ) disorders. This price includes a top up, if required, at the two week review.