We’ve all been there—popping a piece of peppermint gum to freshen up before a meeting or to keep from snacking between meals. For the most part, sugar-free gum is a dentist’s best friend. It stimulates saliva, washes away food particles, and can even help strengthen tooth enamel. But like anything else, there is a limit. If you find yourself going through a pack a day, your jaw and your teeth might be trying to tell you something. Here is what happens when a casual habit turn