This document discusses bruxism, which is teeth grinding or clenching. It can damage teeth and cause headaches or jaw pain. Bruxism often occurs during sleep but may also happen when feeling anxious. Stress is a common cause. Other potential causes include misaligned teeth, injuries, or certain medications. Signs of bruxism include unusual tooth wear, jaw muscle tension, morning headaches or jaw pain, loose teeth, and facial soreness. Prevention methods include reducing stress, tobacco, alcohol and caffeine. A custom mouthguard can stop teeth from grinding and prevent further damage.