What is Clenching and Grinding? 

These are typically both involuntary functions of the jaw that consist of the jaws biting together with force (clenching) and possibly moving back and forth (grinding.) Both clenching and grinding often occur at night but may occur during the day during stressful periods. If done during the day, it is crucial to notice when these habits are happening and try to stop them. If they occur at night, a nightguard may be useful to prevent damage to the teeth.