The best way to stop the pain of tooth decay quickly is to visit the hospital for filling treatment as soon as possible. Only by removing the decayed tooth around the cavity and then repairing the cavity with a filling can the painful tooth decay problem be solved fundamentally. However, if the tooth decay itself is already very serious and the cavity is deep enough to expose the nerve of the tooth, the effect of simple filling is not good in this case, and root canal treatment is needed. The so-called root canal treatment is to remove the nerve from the pulp chamber of the tooth. After that, the inside of the root canal is thoroughly disinfected and then the root canal is filled with special material so that the root canal can be sterile for a long time. However, after root canal treatment, the tooth without the nerve will become weaker. It is advisable to place a porcelain crown to protect the remaining tooth and also to restore the chewing ability of this tooth.