Loose teeth are mainly caused by periodontitis, apical periodontitis or dental trauma, general lack of vitamins will not cause loose teeth. 1. Periodontitis: Periodontitis will lead to inflammatory resorption of alveolar bone, which will cause teeth to lose their support and fixation, resulting in loosening or even loss of teeth; it is necessary to consult a doctor for periodontal treatments (e.g., ultrasonic scaling, periodontal scraping, etc.) in order to treat the above symptoms. 2. Apical periodontitis: due to untreated pulpitis, the inflammatory substances spread to the periapical tissues causing resorption of the alveolar bone, which leads to the symptoms of loosening of the teeth; it is necessary to undergo endodontic treatment to remove the necrotic pulp and inflammatory substances in order to effectively treat the above symptoms. 3. Dental trauma: teeth by external impact will appear loose teeth and bleeding gums and other symptoms; must seek medical treatment for loose teeth fixed treatment, the use of oral professional materials to reset the loose teeth fixed. Loose teeth recommended for symptomatic treatment, should not buy and take vitamins, the treatment of loose teeth is ineffective.