When the tooth is weak, sore and soft, the following treatment measures can be taken respectively: 1.When heavy abrasion occurs on the jaw surface and soreness appears, solutions such as sodium fluoride and strontium chloride can be applied to the sensitive area or laser irradiation can be taken to close the end of the dentin tubules to reduce the transmission of stimulation. 2.X-ray shows that the tooth suffers from deep caries, periapical inflammation occurs, and a large amount of inflammatory secretion exists in the root, pulp opening and drainage can be performed to complete root canal treatment and promote the recovery of the root. If the root surface is attached with a large amount of calculus, resulting in atrophy of alveolar bone, mild loosening of teeth and weakness of chewing, subgingival scraping and root surface leveling can be performed to remove calculus and granulation tissue, and if necessary, bone powder and periosteum can be placed to guide the formation of new periodontal tissue.