If the tooth is painful, especially when drinking cold or hot water, you need to take a film to check the depth of tooth decay, if the tooth decay is deep but no nerve is exposed, you can choose indirect pulp capping, using calcium hydroxide preparation to indirectly cover the pulp and then fill it. If there is nerve leakage on the radiograph, root canal treatment will be performed. If the tooth is painful due to a hidden fracture, you can remove the fracture, then fill the tooth, and choose to have a full porcelain crown wrapped around the tooth, which will help prevent the tooth from splitting. If you drink hot or cold water and are only slightly sensitive, for example, if you have a wedge-shaped defect in the tooth, you can choose to fill the tooth directly to quickly relieve the pain and it is recommended to change the way you brush your teeth and not to brush horizontally.