Teeth that hurt when they touch cold water need the following treatments:1. Heavy wedge-shaped defects formed in the neck of the tooth, which are sensitive to cold water need to be prepared for cavities and filled with composite resins.2. Teeth that have hidden cracks, where cold and hot stimuli will be transmitted to the pulp along the cracks to produce pain and soreness can be removed by abrasion of the cracks and then mended, and when cracks are deep enough to reach the pulp to cause pain that can’t be relieved, the pulp can be removed by abrading the pulp under local anesthesia to complete root canal treatment. Root canal treatment, in order to avoid the crown cracking, it is best to make a full crown repair. 3, crowns form deeper cavities need to grind away the decayed tooth tissue, use calcium hydroxide to protect the pulp, with zinc polycarboxylic acid cementum double-layer cushioning and then close the cavity.