If the protrusion of the mouth does not affect the function of the bite and the patient’s aesthetic requirements are not particularly high, the tooth may not be extracted and there is no need for treatment. However, if the patient is not satisfied with the shape of the protruding mouth and requires correction of the protruding mouth and orthodontic treatment, the teeth must be extracted because there is no way to retract the protruding mouth without extraction. This is a very normal phenomenon, imagine an orangutan or a monkey with a protruding mouth, but if we try to keep the mouth and the chin-nose line at the same level, we need to remove the teeth so that the mouth can be retracted as much as possible.