Pulpitis of teeth without cavities may be retrograde pulpitis caused by periodontitis. If periodontitis can be controlled, root canal treatment and periodontal treatment will be carried out at the same time, and if periodontitis is very serious, the affected teeth should be extracted, as follows. 1. Periodontitis can be controlled: If the periodontal pockets can be eliminated or lightened after treatment, and the lesions can be controlled, root canal treatment and periodontitis sequence treatment can be carried out at the same time. Including root canal preparation, root canal disinfection, root canal filling, as well as supragingival cleaning, subgingival scraping and so on. 2. Severe periodontitis: If the periodontitis is severe, the tooth loosening is obvious, and the inflammation cannot be controlled, then the affected tooth will be extracted. The same disease, the patient’s condition is different, the choice of treatment is different, it is recommended to go to the hospital to receive regular treatment.