The two grinding teeth next to each other can do root canal treatment, as long as the teeth need to do root canal treatment can be done, it is recommended to do crown restorations after treatment to protect the teeth, specific can go to the hospital to visit the examination and treatment. When the molar teeth appear pulpitis, periapical inflammation and other diseases generally need to do root canal treatment, two teeth next to each other have root canal treatment indications can do root canal, whether to do root canal treatment and whether the teeth are next to each other has no relationship. After root canal treatment of two adjacent molars, if the missing area of the tooth is large, it can be restored with pile core crown, and usually a single crown is restored. If the gap between the two teeth is large or the root of one of the teeth is short, etc., which is prone to instability, food impaction, etc., a joint crown restoration can be done after root canal treatment.