Tooth decay is also called dental caries, the main treatment methods are as follows: Firstly, if the caries has not developed to the nerve, resin filling can be considered; if the caries is close to the nerve, a layer of calcium hydroxide cushion can be applied first, and then resin filling can be applied, and after filling, the patient should avoid eating too cold or too hot food for 3 months to stimulate. Secondly, if the caries has developed to the nerve, the bacteria has entered the nerve and caused the pulpitis, the simple filling can not solve the problem, need to carry out the root canal treatment, come to the hospital 2-3 times, through the root canal treatment can completely remove the inflammation, the toothache will not happen again.