The fancy name for teeth grinding and clenching is bruxism. When you’re feeling particularly stressed or frazzled, you might find yourself tightening your jaw and clenching your teeth, and this might not cause any damage at first. However, if you are one of the many people who grind regularly, such as in your sleep when you aren’t even aware that it’s happening, you might end up with scary problems like loose, worn, or fractured teeth, along with jaw problems like temporomandibular joint disorder (TMD or TMJ).