About the timing of orthodontics, many people have questions, such as whether there are requirements for age, whether it will affect the future function of the teeth, etc., to address these issues, science, the movement of teeth is a physiological bone remodeling process that exists at any age, so orthodontics is suitable for both young and old. However, different individuals have different problems, and the time to start orthodontic treatment is not the same. In general, the best age for fixed orthodontic treatment is around 12 years old, when all primary teeth are replaced and the second permanent teeth erupt. However, when a child has a “grounded sky”, serious buck teeth, “small chin”, early loss or retention of milk teeth, permanent teeth have not erupted and bad oral habits such as lip biting, finger sucking, mouth breathing, snoring, etc., they should go to the hospital as soon as possible. As long as the periodontal condition is good, orthodontic treatment can be carried out at any age, but adults will be subject to certain restrictions when receiving orthodontic treatment, and the difficulty of orthodontic treatment has also increased. In this special reminder to distinguish the harm caused by periodontal disease and malocclusion, the culprit of “old tooth loss” is periodontal disease, not due to orthodontics. When the oral environment is poorly maintained, the plaque on the surface of the teeth is not cleaned in time, and the minerals in the saliva further act to form tartar, which slowly builds up over time and infects the surrounding tissues causing periodontitis. The tissues around the supporting teeth, such as the alveolar bone, are resorbed due to periodontitis, and the area of the tooth root surrounded by the alveolar bone decreases with the resorption of the alveolar bone, and finally loosening and falling off occur. Therefore, during the orthodontic process, in addition to regular and careful brushing to clean around the brackets, you can also use dental floss, gap brushes and flushers to clean the teeth thoroughly. We would like to remind those patients who are wearing orthodontic braces for the first time that there will be some uncomfortable reactions in the mouth, such as tooth soreness, mucosal damage, ulcers, etc. These phenomena can be relieved or eliminated in about three days to a week. If the pain is severe, it is not normal and should be promptly consulted. Avoid chewing hard foods, such as ribs, beef jerky, and snacks with cores and shells. Avoid chewing sticky foods, such as chewing gum, glutinous rice products, milk candies, etc. Try not to drink drinks with high sugar content, such as carbonated drinks, fruit juices, etc.