1) The destruction of tooth structure or the wear of nonfunctional teeth: it causes patients to be sensitive to cold and heat, and even worse, the dental pulp is sick and the crown and root are broken.
(2) Teeth shaking, but no obvious periodontal disease: especially when getting up in the morning.
(3) Changes of periodontal tissue: Molar will not damage the tooth storage tissue, but only change its physiological adaptability.