If the tooth feels cold, the following treatment measures can be taken respectively: 1.Filling: When deep cavity is formed in the crown, it can be placed with polycarboxylate zinc cementum cushion after removing the decaying matter and filled with composite resin, etc. 2.Repair: When deep hidden fracture appears on the tooth surface, it can be repaired by grinding away the fracture, preparing the cavity type and using glass ion cementum, etc. The fluorine ion it contains can promote the enamel remineralization and enhance the acid resistance; When a wedge-shaped defect is formed in the cervical part of the tooth, which cannot tolerate hot or cold stimulation, the cavity can be simply prepared and repaired by applying composite resin, etc. 3.Drugs: When heavy wear occurs on the tooth and dentin is exposed, anti-allergic drugs can be applied to the sensitive area and the dentin tubules can be closed. 4.Surgery: When severe periodontal atrophy occurs and the root is exposed, guided tissue regeneration can be performed to restore periodontal attachment.