Generally, whole mouth correction is needed. Although a single row of teeth will make the corrected teeth neat and beautiful, if only the upper jaw is made without the lower jaw, all the teeth involved in the correction will move to a certain extent after the upper jaw is aligned, but the teeth with uncorrected lower jaw will not move, which will lead to the change of occlusion. Generally speaking, it is not recommended to correct half a tooth, unless the patient's tooth deformity is really a very, very simple situation, and fine-tuning the occlusion can be done. Otherwise, once the occlusal disorder is caused by half-mouth orthodontics, it will be difficult to end it. At that time, it will be necessary to do another complete orthodontics. At that time, it will really outweigh the benefits.

When only partial correction is carried out, it is impossible to manually correct the occlusal relationship between the upper and lower jaws, so the occlusion will be worse after correction, which will affect the most basic function of teeth-chewing, thus affecting the digestive mechanism.