1, after the removal of the aligner, because the teeth are still unstable in their new position, you need to wear a retainer to maintain the new position of the teeth on the alveolar bone. 2, the general situation with retainers need 2-3 years, the first year day and night with, after that can only night with. If you have to take it off for something important, take it on as soon as possible after it is over to avoid tooth displacement. 3. You must take off the retainer when you eat, and brush your teeth after eating before wearing the retainer. You can’t eat or drink anything with retainer, and you can’t drink water higher than 50 degrees to avoid deformation and failure. 4, retainer can be rinsed with water, can not use boiling water or alcohol, can regularly use the denture cleaning tablets to clean the retainer, prohibit other cleaning agents. When not in use, it should be placed in the box and soaked in cold water. 5, it is recommended to review 3-6 months, if you find that the aligner is damaged or the teeth shift recurrence should be reviewed immediately.