The most common causes of loose and painful teeth are caries, periodontitis, combined periodontal and pulpal lesions, etc. Different programs should be taken according to different causes, including root canal treatment, scaling, periodontal scraping and extraction. 1. Inflammation of the pulp caused by caries can be treated with thorough root canal therapy, followed by filling with resin material or wearing a crown to protect the tooth. 2. Periodontitis leads to comprehensive lesions of pulp and periodontium, which requires joint treatment of dentistry and periodontology, treating periodontitis first and then treating the diseases of dental tissues, which can be taken as scaling, periodontal scaling to treat periodontitis, and root canal treatment for pulpal diseases. 3. Loose or caries very serious teeth, can not be retained, it is recommended to extract. In conclusion, there may be other causes of loose and painful teeth, if there is no improvement through scaling, periodontal scaling, periodontal and endodontic combined treatment, the third degree of looseness or more should be extracted.