There is no scientific basis for the statement that teeth are more likely to fall out when you get old after orthodontic treatment. 1. The reason why people tend to lose their teeth when they get old is that with the decline of human body functions, the dental tissues gradually deteriorate, which in turn exposes the roots of the teeth gradually and lacks attachments, resulting in the loss of teeth. Orthodontics is the use of orthodontic appliances to gradually straighten the teeth to the designed position. This process is slower and less damaging to the teeth, so the situation of losing teeth more easily in old age usually does not occur. 2. In daily life, periodontitis can easily lead to tooth loss, which is mainly caused by the invasion of bacteria in plaque into the periodontal tissues, which can cause damage to the gums, alveolar bone, dentin and so on. If not treated in time, loose teeth will be lost. Whether the teeth are easy to fall out in old age is closely related to long-term daily care. Therefore, in the process of orthodontic treatment, you should pay attention to oral hygiene and clean the aligners regularly so as not to cause dental diseases.