Grinding is one of the first signs you’re not getting deep, restful sleep. When your airway is even slightly blocked at night, your brain moves the jaw to open it — that’s what grinding is. It’s your body fighting to breathe. That’s why I never prescribe a night guard without a sleep study first. If sleep apnea is involved (and it often is), a mouthguard can make it worse by further blocking the airway. Grinding destroys your teeth over time. • Wears down enamel permanently • Makes teeth look ye