Bruxism is grinding and clenching of the teeth with unconscious contractions of the temporal and masseter muscles while awake or during sleep. Bruxism occurs in 8%-16% of the population and is often an underdiagnosed condition that not only leads to dental problems but also to pain in the teeth, jaw, temporomandibular joint, and neck; headaches; and potentially, to tooth loss. Multiple studies have shown that botulinum toxin injections into the masseter and temporalis muscles result in relaxation of the muscles and improvement of bruxism and the pain associated with chronic clenching and grinding. In our clinic, botulinum toxin is a safe, effective treatment for patients who grind, clench, develop temporal-mandibular joint pain, or have masseter hypertrophy. Clinical improvement starts within 3-5 days, and patients can expect to have relaxation of the muscle and decreased pain for 6 months. Most patients also report thinning of the face and jaw, which is a much anticipated and appreci...