Causes. Doctors have yet to discover what is the root cause of bruxism. For now, they believe that it is a combination of biological (genetical), psychological, and environmental factors. Things such as alcohol, caffeine, and various drugs can contribute to bruxism. Awake bruxism can happen as a result of psychological factors such as stress or tension. It can be a coping mechanism in such cases. Sleep bruxism can come as an association with chewing during the day. Children mostly experience bruxism, but because their jaws are not so calcified, teeth grinding is not such a major concern.