Conventional root canal treatment for pulpitis requires 3-5 visits: the first visit, if the symptoms are acute, such as acute pulpitis, the patient is first treated for pain relief; the second time the entire pulp cavity is opened, all the infected material is removed, and calcium hydroxide is sealed for effective disinfection; the third time the original sealed medication is removed, and the tip of the cement and the root canal sealer are filled. The third time is often the smoothest. In fact, in specialized hospitals and specialists, we often see root canal atresia, root inaccessibility, extreme calcification or bending of the root, or tilted crowns and pulpitis in wisdom teeth, because the patient has limited time to open his mouth. Usually a procedure cannot be completed in one visit, and a procedure is divided into 2-3 visits, in which case the number of visits to the patient increases accordingly.