The maintenance after orthodontics is generally one and a half to two years. /kloc-under the age of 0/8, it is generally required to be worn 24 hours in the first year (except for eating and brushing teeth). In the second half of the year, gradually reduce the time of wearing the retainer every day, as long as there is no rebound trend, you can gradually reduce the time. Until it is removed. Adults wear it for a little longer, and few adults need to wear retainers because of occlusion. I am an orthodontist, and I only do manual work. I hope to adopt.