Bruxism is the grinding or clenching of teeth which occurs primarily when a person is sleeping, but can occur anytime a person is stressed. People with bruxism experience symptoms such as sore jaw, tightness or pain in the jaw joint (TMJ) and sensitivity, especially when they first wake up. However, most people are unaware of their habit. When clenching your teeth are applying 10 times more pressure than normal chewing. If left untreated you may see visual signs of flat or worn teeth, chipped or cracked teeth, damage to the bone around teeth and damage to your jaw joint (TMJ). Dental professionals have found that some of the causes of grinding are related to stress and can be significantly reduced with the use of a nightguard while sleeping.