There is no harm in straightening teeth and extracting teeth. However, in the process of correction, the patient's diet will be restricted, and pain and tooth extraction may occur in the initial stage of correction. About 50%-60% patients need tooth extraction to achieve the effect in the process of correction, but tooth extraction correction is harmless. The specific reasons are as follows:

1. Some patients may have temporary psychological defects due to missing teeth, but their appearance will be improved due to the reduction of teeth, so there is no harm from the aesthetic level;

2. During the treatment, the doctor makes a treatment plan according to the patient's personal situation, which will not affect the patient's chewing function;

3. If the teeth are uneven, the quality of long-term brushing will be very low, which will easily lead to periodontitis, gingivitis, tooth decay, tooth looseness and so on. It is suggested to correct the teeth and keep the mouth clean better.