Sore teeth may be the occurrence of dental hard tissue disease, periodontal tissue disease or other undesirable factors cause dentin exposure, tooth sensitivity symptoms. 1. Dental hard tissue disease: when there are caries or teeth wedge-shaped defects, excessive abrasion, cracked teeth will lead to, dentin and the outside world in contact with the production of sensitive symptoms. 2. Periodontal tissue disease: the enamel of the neck of the tooth is very thin, or there may be no enamel cover, periodontal disease, gum recession, or the formation of periodontal pockets, can lead to the neck of the tooth dentin exposure and sensitivity. 3. Other undesirable factors: dental restoration restoration is not close, the dentin at the gap can be exposed, may also be excessive human operation of subgingival cleaning and root planing, destroying the surface of the root of the tooth bone so that the exposure of the dentin. Tooth soreness is mostly due to dentin sensitivity, it is recommended to go to the hospital in time to avoid aggravation of the symptoms.