Generally, the retainer should be worn for at least 2 years, and the first year after the orthodontic treatment is over, it should be worn 24 hours a day, only when you eat or brush your teeth, and all other times. The second year you can wear it 12 hours a day, you can wear it at night when you sleep, you can not wear it during the day. After two years, you can gradually reduce the wearing time, and observe whether there is any change in the tightness of the retainer. If you don’t wear it for a long time, when you wear it again, it is loose and there is no change in the tightness, it means that the teeth are more stable at this time, so you can consider not wearing it, but for severe twisting of teeth, teeth with multiple gaps, it needs to be maintained for a longer period of time, and there are special cases that need to be worn for life, the specific wearing time or completely listen to the attending orthodontist.