You might have a disorder called bruxism if you've never before complained of having painful jaws or excruciating headaches but suddenly you just can't seem to stop having them. A disorder known as bruxism causes you to clench, grind, or gnash your teeth. If you clench or grind your teeth while you are awake, it is known as awake bruxism; individuals who do so while they are asleep are said to...