1. For patients without extraction, due to the narrow space and strong sense of crowding in the limited oral space, there are always some teeth moving in the direction of low resistance in the form of "being squeezed out". If you are a corrective case without tooth extraction, you will always move a little. Therefore, patients choose non-tooth extraction scheme because they don't want to extract teeth. In fact, the long-term recurrence rate is high. Generally speaking, non-extraction cases advocate permanent retention (lifelong retention) to resist the recurrent tooth movement caused by crowding and tight space.
2. If the eruption period of wisdom teeth is combined, tooth movement will be easier. The principle is the same as above, that is, the problem of crowded space. After the age of 20, wisdom teeth are mature. Because of insufficient space or incorrect direction, the eruption period and process of wisdom teeth can last for several years or even more than ten years. Always in the direction of eruption, so the teeth in front of wisdom teeth always push and move in the direction of low resistance.
3, individual differences, some people are very sensitive, in the correction period, it is easy to have tooth movement, a little adjustment, that is, very active changes and tooth movement, such patients, he must strictly wear the retainer after taking off the appliance, and extend the retention period, because his tooth movement is more active and sensitive.
Now you can consult a doctor: Do you need to use a mold as a retainer to keep the status quo, otherwise it will become more chaotic. You have to check it yourself before you can make a decision and give advice. Don't buy any appliances yourself, which is easy to cause problems in the knowledge and logic of orthodontists.
Netizens want to know more about the wearing requirements of the retainer, the recurrence and maintenance after correction. Please refer to the article Classification of Corrective Counseling: VIII. Corrective consultation for recurrence, rebound and maintenance after correction "