Sleeping often gurgling sound, the medical grinding of teeth is called night molar disease. It is a phenomenon, not a disease, as in dreaming and talking in your sleep. The etiology of nocturnal teeth grinding is still unclear, and is currently believed to be related to a variety of factors such as psychogenic and occupational (excessive emotional stress or excitement), odontogenic (bad biting habits), systemic (intestinal parasitic infections, etc.) and spontaneous. Since there is no food in the mouth when you grind your teeth at night, this becomes “dry grinding”. If the “dry grinding” often, the wear and tear on the teeth is quite serious. Over time, the worn teeth will become sore or painful to varying degrees, and even cause periodontal tissue damage, tooth loosening or displacement, gum recession, alveolar bone loss, masticatory muscle fatigue and temporomandibular joint dysfunction (manifested as painful popping of the jaw joint, restricted mouth opening and other symptoms).