Bruxism is the clenching and / or grinding of your teeth, especially at night. Clenching refers to tightly clamping your top and bottom teeth together. The force of clenching causes stressful pressure on the muscles, tissues and jaw. Jaw disorders, jaw pain, soreness, headaches, earaches, damaged teeth and other problems can result from bruxism. If clenching causes jaw pain, it can disrupt sleeping and eating, lead to other dental problems or create TMJ problems. Nightly grinding can also disturb sleeping partners. Your dentist can make a clear night guard for you to sleep in to alleviate the clenching or grinding.