It's 1.30am. I'm awake, listening to branches screech against my bedroom window. Then I remember: there are no trees anywhere near my window. What I am actually hearing is my fiancé's teeth grinding.

Grinding your teeth — a condition known medically as “bruxism” that also encompasses clenching and gnashing your teeth — is a harmful habit that can wreak havoc in your mouth. A lot of people do it ...