The process of rotten tooth nerve starts from tooth decay. In the beginning, there are bacteria attached on the surface of the tooth, and if there is too much sugar intake and no good oral hygiene, the local bacteria will decompose the sugar and produce acid, which will attack the tooth, and the hard tissues of the tooth will be gradually destroyed and gradually aggravated until the tooth nerve, and the bacterial infection of the tooth nerve will appear. Once the nerve is infected with bacteria, inflammation will occur, which will gradually lead to necrosis of the nerve and the whole process of rotting the nerve. In this case, aggressive root canal treatment should be performed to get rid of all the bad nerves, then disinfect the root canal, and finally fill the whole root canal with artificial material.