Root canal treatment requires a crown. 1. After root canal treatment, the missing area of the tooth is large, lack of nutrient supply, hardness is relatively poor, and the tooth is prone to splintering if not protected. 2. The defective area of the tooth after root canal treatment is generally too much. In addition, after root canal treatment of the tooth is no nerve, blood supply, the tooth is easy to become brittle, in the process of using the tooth, easy to crack the situation, wearing a crown can be wrapped up the tooth, can effectively avoid the tooth splitting. In the teeth after the problem, the need for timely medical treatment, clear and complete the relevant examination, clear condition, under the guidance of the doctor to choose the appropriate treatment to avoid adverse consequences.