Usually, we take more of an attitude of ignoring or tolerating the missing teeth other than incisors, and we stay more on the level of aesthetics and function in terms of the requirements of teeth, but in fact we should also consider the level of health. The harm of a missing tooth is far from stopping, it will also cause direct or indirect harm to the adjacent teeth on both sides, the opposing teeth and other teeth, and the harm spreads to the whole mouth. First of all, after the tooth is missing, if not treated in time, it will lead to the loosening of the adjacent teeth: after the tooth is missing, the adjacent teeth will be tilted to the gap because there is no fixed reliance, which will cause the loosening of the surrounding adjacent teeth over time, resulting in serious damage to the normal function of the whole mouth teeth. Hazard two, food embedding, the root cause of bad breath Normal teeth and teeth, arranged ten closely, once the adjacent teeth move, there will be gaps between teeth and teeth, easy to make food embedded in the gap between teeth, thus causing bad breath, dental caries, periodontal disease, etc. The third hazard is that bacteria accumulation and caries is difficult to prevent. The missing teeth will lead to food embedding, so it is very difficult to clean the food embedding into the teeth gap, and the long time bacteria accumulation will cause caries.