The most likely cause of tooth root exposure is chronic periodontitis. In periodontitis, the long-term chronic inflammation of the periodontium will lead to the gradual resorption of the alveolar bone, exposing the tooth root in the oral cavity, resulting in root exposure, which will result in a series of clinical symptoms, such as tooth sensitivity and gradual loosening of the teeth. In the treatment, periodontal treatment should be carried out first, to control the periodontal inflammation to prevent further exposure of the tooth root, the main treatment method is ultrasonic cleaning. If the periodontitis is particularly severe, deep periodontal cleaning, such as periodontal scaling, root planing, or even periodontal flap flap surgery, will be performed. If root exposure has caused tooth sensitivity, patients can use desensitizing toothpaste applied locally to the roots of the teeth to seal the dentin tubules and prevent the symptoms of dentin hypersensitivity from appearing. If root exposure is significant and the tooth has gradually loosened, multiple teeth can also be restored with porcelain crowns to restore the shape of the tooth and alleviate the gradual loosening of the tooth.