It is not advisable to only fill the tooth after opening the pulp, it is recommended to fill the tooth after root canal treatment. If a tooth has pulpitis and only pulp is opened, it is only a temporary relief of tooth pain. If not treated, necrosis of the nerve of the tooth may occur, and the inflammation may spread further and develop into apical periapical inflammation, resulting in destruction of the periapical tissues. It is recommended that patients continue to complete root canal treatment, and fillings can only be done after root canal treatment is completed. Root canal treatment is to first expose the pulp cavity, then remove the infected material in the root canal, remove the pulp, use dental special instruments to enlarge the root canal, make the root canal open, prepare the root canal, then disinfect the root canal, put disinfected items into the root canal, temporarily closed, to achieve the effect of disinfecting the root canal, and then use dental special filling materials, fill the root canal to prevent bacteria and other re-infections. Generally root canal treatment requires 2~3 times. Patients are advised to standardize their treatment under the operation of a specialist.