mellowgureum2dI went to the dentist because of severe teeth grinding, and they said my molars are worn down and recommended a mouth guard. I got a custom one, and the first week I lost sleep from the foreign body sensation, but now I can't sleep without it. The biggest thing is that my morning headaches and jaw stiffness are gone. Since teeth don't come back once they're worn down, don't put it off. See original1