The causes of tooth loosening are commonly due to periodontitis, jaw trauma, periodontal membrane inflammation. To ensure that the tooth does not loosen after root canal treatment, it is necessary to make sure that there is no cause of the above mentioned illnesses and to maintain oral hygiene and regular checkups. 1. Ensure oral hygiene. To keep the tooth from loosening after root canal treatment, it is necessary to carefully clean the oral hygiene, effectively brush the teeth, and learn to use dental floss. This will prevent periodontal inflammation that can lead to loosening of the tooth. 2. Regular review. Root canal treatment needs regular review to find problems in time, after root canal treatment, some teeth may be due to the body’s own resistance is poor, caused by the root canal treatment of diseases leading to tooth loosening, the need for regular review to find the problem as soon as possible to re-root canal treatment, apical surgery, occlusal high point adjustment grinding, and regular cleaning, timely crown repair. If you want to make sure that your teeth are not loose after root canal treatment, it is recommended that you have regular checkups to find problems so that they can be dealt with in time.