All rebound after a few years of teeth straightening, usually refers to a few years after orthodontic treatment, the re-emergence of misalignment of teeth, most of the reasons are related to the failure to follow the correct care or wear retainers, improper operation during the orthodontic process and often eat too hard food. Patients are advised to consult with their doctors and undergo appropriate examinations to choose a suitable method for orthodontic treatment according to the specific situation and examination results. Secondary orthodontic treatment usually includes extraction surgery, braces, surgical procedures and combined orthodontic treatment. After orthodontic treatment, patients need to strictly follow the doctor’s instructions and take care of the braces on the teeth, do not remove the braces privately, resulting in the rebound of orthodontic treatment. The orthodontic treatment plan can be adjusted in a timely manner by following the doctor’s instructions and reviewing the orthodontic situation and whether the occlusal relationship is normal. After orthodontic treatment, you should minimize or avoid chewing hard food to avoid affecting the orthodontic effect, and you should follow up promptly when any uncomfortable symptoms appear. In addition, after orthodontics, attention should be paid to maintaining oral hygiene, correcting bad oral habits, and using the correct and standardized brushing method for oral cleaning after eating. You can use dental floss, gap brush and other cleaning supplies for local cleaning to avoid food residues, bacteria and other retention of teeth and gum disease.