Teeth grinding is also known as bruxism. This is a common condition where you may clench or grind your teeth typically over night. How do I know if I am grinding? You may wake up in the morning with a dull ache, the best thing you can do is ask your dentist if he sees any signs of grinding. What can I do? You can have a custom night guard made by your dentist to wear at night to protect your teeth from the harm it causes by grinding.