Miss Zhang this year, more than 30 years old, the past two years, acid eating cold food will be full of toothache. To the hospital for an examination to know that her molar teeth of the shorter, and some only normal teeth half and did a bite protection pad, before symptoms start to improve. According to Jinan City oral hospital experts, some of the children Huanya night molars have the habit, which is a normal bite the establishment of relations activities, is a normal phenomenon, with the formation of normal relations between the bite, molar night will disappear without treatment. There is a category of the night molars are sick, people who have such symptoms could account for nearly one-third. At night and wear a molar tooth enamel surface, will dentin exposed to cold, heat, acid, chemical irritants, such as sweet or hard objects, such as physical stimulation are allergies, cause pain; pulpitis can cause serious, bite wounds , Periodontal tissue damage. Molar patients should be early treatment. Molar habits of patients with serious, can tooth shape to be a night to protect molars bite pad, sleeping at night when wearing the upper teeth, the molars to stop the action have, to protect the tooth surface bite.