Root canal treatment without film is not reliable, root canal treatment before the general need to take preoperative film, root canal treatment filling need to take a test tip film, postoperative film to confirm the completion of the filling of the film to confirm the effectiveness of the treatment, it is recommended to go to a regular hospital. The regular steps of root canal treatment require preoperative radiographs to confirm whether there is any inflammation or cyst at the root tip of the tooth, and to check whether there is any abnormal curvature of the tooth root canal and the original treatment filling condition, so as to avoid any mistakes in the treatment. When filling a root canal, it is usually necessary to take a radiograph to check whether the tip of the filling fits the length of the root canal, which is conducive to perfecting the root canal filling. After root canal filling, radiographs are taken to confirm the effectiveness of the filling treatment, to avoid underfilling or overfilling of the root canal, and to avoid missing the root canal.