Overall, the impact is not great. In most orthodontic cases, the range of tooth movement is forward and backward, so the appearance of facial profile changes the most. For example, in the case of sudden teething, the lips will be easier to close because the front teeth move backward, and the front teeth are not easy to be exposed, so the face will look better from the side or from the front. Because it involves future stability, general orthodontics does not change the width of dental arch much. Even in some adolescent cases, rapid maxillary expansion may be used to correct the narrow maxillary arch, but it should not have much impact on the width of the face.