Bruxism is an excessive clenching or grinding of the teeth that is not a part of normal chewing movments. It can lead to excessive wear on the teeth and may camuse permanenet daage to the teeth and the jaw joints.
Excessive clenching and grinding of jaws are not health actions. In some adults and childeren, clenching and grinding may occur during the day or at night. During sleep they have no conscious control over this execcisve clenching and grinding.