Orthodontics is a good way to make teeth healthy and whiten, but whether teeth will loosen after orthodontics has become a common concern. So, will the teeth loosen after orthodontics? Experts tell you. To understand this problem, we must first understand the tooth structure. People's teeth are divided into two parts: those exposed in the mouth are called crowns (that is, teeth that can be seen in the mouth) and those that grow in the gums are called roots. The root of a normal tooth is completely buried in the alveolar bone, so it is very strong. But teeth are not as immovable as nails on a board. In fact, teeth are "suspended" in alveolar bone, and this suspension system is periodontal ligament. The elasticity and toughness of periodontal ligament make teeth loose when they exercise their functions, so as to avoid injury. This phenomenon is called physiological activity of teeth. After the tooth is pulled out, if it is not treated for a long time (denture inlay, correction, etc.). ), the adjacent teeth may tilt to the edentulous area, leading to periodontal disease, occlusal trauma and other problems, making the gums loose. However, as long as the teeth are corrected in time, the extraction gap is closed and the normal occlusion relationship is restored, the teeth will not loosen. In the process of orthodontics, periodontal ligament, alveolar bone and other structures will be reconstructed accordingly. Some patients will have slight loosening of teeth, weakness in chewing, pain and discomfort, which are normal reactions during treatment. After correction, these phenomena will disappear and the teeth will return to normal. When the alveolar bone around the root is gradually absorbed for some reasons (such as long-term periodontal disease), the teeth will begin to loosen. This looseness is morbid. The more alveolar bone is absorbed, the looser the teeth are. When the alveolar bone is completely absorbed, the teeth will fall off. At present, in China, the incidence of periodontal disease is above 80%. When people are old, the main reason for tooth loosening and falling off is periodontal disease. In other words, when people are old, tooth looseness has nothing to do with orthodontics. In fact, after orthodontic treatment, the teeth are arranged neatly, which is beneficial to oral cleaning and can assist in the treatment of periodontal disease. In this sense, orthodontics can prevent people from loosening their teeth when they are old.