Root apical inflammation is professionally known as periapical inflammation, from the theory of periapical inflammation after the extraction of the tooth patient pain symptoms will be significantly relieved, but in the actual clinical work there is no because of simple root apical inflammation and the operation of the extraction of the tooth. Because each tooth is very important, its bear very heavy chewing function. Without special circumstances, the tooth must be protected to the best of its ability. Especially in the case of apical periodontitis itself, which is a completely preservable disease, there is no need to remove the tooth. Whether it is acute or chronic, first go to a professional stomatology department by the stomatologist to determine the position of the tooth after the application of dental power system, that is, high-speed turbine drilling to open the pulp of the tooth, so that the pulp and apical inflammation through the open perforation of the pulp hole to get full drainage, drainage clean after the application of root canal treatment and crown restoration of the tooth to be re-treated to protect the tooth, the tooth can continue to a long time for the masticatory functions The tooth can continue to serve the chewing function for a long time and there is no need to extract it.