There are various reasons for patients to lose a piece of their teeth, and there are differences in treatment, so it is not possible to generalize. If the patient’s teeth have traumatic injuries such as cracking, impact and biting hard objects with the teeth, it can cause abnormal localized tooth loss, and the patient is advised to visit the hospital in time for restoration. In addition, it may also be caused by dietary stimulation, caries, filling falling out, edentulism, bad bite, calculus, inflammation, etc.: 1. Dietary stimulation: If the patient consumes a large amount of carbonated drinks, too acidic and too sweet food for a long time, it may cause damage to the teeth, thus inducing tooth fracture and partial tooth loss. Generally, patients need to go to the hospital to use silver nitrate solution, compound iodine glycerin and other drugs to reduce inflammation, as well as crown restoration, ligature fixation, root canal treatment and other surgical methods; 2, caries: mainly due to bacterial infection triggered by the partial loss of teeth, and show the form of cavities, often accompanied by toothache, tooth sensitivity, bad breath and a series of clinical manifestations. For treatment, patients need to use drugs such as sodium fluoride glycerin, silver nitrate, ammonium fluoride and other drugs to treat cavities, as well as acetaminophen, ibuprofen and other drugs to relieve pain under the guidance of doctors. At the same time, it is also necessary to choose resin filling, root canal treatment, tooth extraction and other treatments according to the degree of caries; 3. Filling falling off: If the patient has carried out resin filling treatment after the caries appeared, it is possible that part of the filling will fall off, thus the patient will feel part of the tooth falling off. At this time, the patient is suggested to go to the hospital for caries cleaning and filling again; 4.grinding disease: central nervous abnormalities, occupational factors, gastrointestinal diseases and other conditions can induce grinding disease, and the patient’s teeth may fall off the block because of excessive friction. Usually need to be treated for specific triggers, such as the presence of central nervous abnormalities patients can take diazepam, eszopiclone, zolpidem, zaleplon and other drugs for treatment, gastrointestinal diseases patients need to take mosapride, cisapride, domperidone and other drugs to promote gastric power for treatment; 5, poor bite: patients with misaligned teeth, multiple births and other conditions, resulting in dental bite disorders, in the long-term After chewing food may cause cusp splitting, and then some cusps fall off, the patient needs to go to the hospital for orthodontic treatment to improve the occlusal disorder; 6, calculus: the patient’s teeth lost a piece, there is the possibility of calculus falling off, which is directly related to poor dietary habits, oral cleaning, etc., the clinical need to be treated according to the condition of calculus, commonly with supragingival scaling, subgingival scraping; 7, the Inflammation: including periodontitis, pulpitis and other conditions, which may cause pulp tissue necrosis, teeth in a fragile state, and may fall out when chewing, mainly treated by root canal treatment, direct pulp capping, pulpotomy, etc.