Root canal treatment in professional terms, to be divided into three steps, as follows: 1, root canal cleaning: most people need to be in the state of anesthesia, first to do painless, and then use instruments to completely remove the dirt on the surface of the tooth, after the pulp chamber and root canal system completely open to form a straight pathway, and then the root canal wall of the infected material completely removed; 2, root canal sealing: root canal system is very complex, in addition to mechanical In addition to the mechanical cleaning effect, it is necessary to use drugs to assist in cleaning; 3, root canal filling: artificial materials are used to close the root canal system completely and tightly, destroying the way for the oral flora to enter the root canal. Precautions are mainly divided into the following points: 1, root canal treatment, the oral surgeon will certainly be carried out in a painless state, to dispel the patient’s concerns, see the tooth is not too painful, basically the root canal treatment operations are required in the state of local anesthesia; 2, root canal treatment after the tooth is more brittle, root canal treatment after the tooth do not bite too hard things, professional oral surgeons will also make reasonable recommendations. It is very important for any teeth in the mouth, for the integrity of the teeth and for the chewing function. Therefore, dental professionals try to keep the natural teeth in the oral cavity as much as possible, and root canal treatment is the last line of defense to preserve the natural teeth.