It can be corrected at any age. Comparatively speaking, the best correction age is 12 to 15. It takes a long time for adults to slowly correct. Adults generally need about one and a half to two years, or even longer, depending on the individual's tooth reduction and alveolar bone absorption. This age belongs to the correction of older age, and adults are indeed more likely to rebound than teenagers, so adults are required to wear retainers for a longer time, and they also need to wear retainers more seriously, which can generally prevent rebound.