1. A gnashing, grinding, gritting, and clenching of the teeth in other than normal chewing movements occurring unconsciously in the daytime; sometimes resulting in a loosening of the teeth and a bleeding of the gums.
2. Compulsive and continual crushing of the teeth together, with intermittent grinding.
3. The involuntary, "nervous" grinding of the teeth while a patient is awake.

It is thought bruxomania occurs as a way to relieve tension or stress and was first diagnosed as a medical condition in 1907.