Botulinum toxin has been widely used in medical treatments for over 4 decades and was first approved by the Food and Drug Administration (FDA) for the treatment of wrinkles in 1989. It works by temporarily blocking the connection between nerves and muscles, thereby enabling muscles to stay relaxed. The injection of botulinum toxin into masseters, relaxes the muscles and reduces involuntary grinding of the teeth and clenching of the jaw. This reduces the wear and tear on the teeth and temporomandibular joints without affecting the ability to smile, speak or chew.