Sudden tooth loss should be a sign of severe periodontitis. The most obvious clinical manifestations of severe periodontitis are bleeding gums, alveolar bone resorption, root exposure, gum recession, and the patient should have loose teeth, and severe teeth will reach third degree loosening, causing the sign of sudden tooth loss. Patients are advised to promptly visit the periodontal department to take intraoral panoramic films to clarify the degree of alveolar bone resorption. If the teeth in the mouth and the alveolar bone are resorbed to the apical part, it is recommended to extract them without any retention value. For teeth with retention value, patients are recommended to undergo periodontal basic treatment in time to remove intraoral stimuli, remove calculus and plaque, etc. After the periodontal basic treatment is completed, then depending on the situation, whether periodontal surgery is required, after the basic treatment is perfected, if there is a first degree loose or second degree loose teeth, the tooth can be preserved by loose tooth fixation.