The occurrence of tooth decay is related to the diet and nutrition hygiene. Without paying attention to oral hygiene, the residue left in the mouth will create conditions for the activity of bacteria and cause the teeth to be corroded and damaged. Especially, after the sweet food is decomposed, the substance produced will cover the teeth and form carious plaque, then by the action of bacteria, acid will be generated, which will firstly corrode the dentin and then damage the dentin. In addition, if there is a lack of calcium in the diet, causing a lack of calcium in the body, or a lack of calcium caused by malabsorption, it will affect the strength of the teeth. Teeth will become loose due to calcium deficiency and form cavities. Because vitamin D can help the absorption of calcium and phosphorus, and vitamin A can increase the antibacterial ability of the mucous membrane of the tooth bed, so it is necessary to pay attention to ensure the supply from the diet. Fluorine must not be deficient, once it is deficient, it can also lead to tooth decay. In the diet, we should eat more foods rich in vitamin D, calcium and vitamin A, such as milk, liver, egg, meat, fish, tofu, shrimp, pineapple, carrot, sweet potato, green pepper, hawthorn, olive, persimmon, sand fruit, etc. The foods that contain more fluoride are fish, shrimp, kelp, jellyfish, etc. Externally used recipe: 1, ash detergent caries (herbal pick up) ash detergent vegetable (also known as ash, golden lock abortion) stem and leaves burn ash, water flood for pill, clear poison wrap, fill into the caries hole. EffectsFill the hole of caries to stop the pain. It is applicable to the pain of caries. 2.Mud of leek root (Qian Jin Fang): 10 leek roots, 20 Sichuan pepper and a little sesame oil are pounded like mud and put on the cheeks of diseased teeth. It is said that “it can be cured for several times”. It is suitable for tooth decay pain. 3.Eggplant formula (Hai Hai Ming Fang): burn the ashes of dried eggplant flowers and apply on the painful area; or pound the juice of eggplant root and apply it frequently, or add the ashes of eggplant tip with fine spices and mix with the tooth caries. All of the above use yellow eggplant (yellow skin color). It is said to have “immediate effect”. Effect to stop the pain of tooth decay. It is suitable for tooth decay pain. 4, Job’s tear and orris powder (“Yong class formula”) with Job’s tear and orris raw research powder, point caries hole, and can be served. Cure tooth decay pain.