Bruxism is a condition in which you grind, gnash or clench your teeth. If you have bruxism, you may unconsciously clench your teeth when you’re awake (awake bruxism) or clench or grind them during sleep (sleep bruxism). Sleep bruxism is considered a sleep-related movement disorder.
Muscle relaxant (or ‘anti-wrinke’) injections can be used to successfully treat this condition. The treatments works by relaxing the masseter muscle.
This is the same technique used to reduce the squareness of the jawline, making your jawline more feminine.