Basically, it won't hurt very much, and a special anesthesiologist will be arranged to inject anesthesia into the patient. Maxillary plastic surgery can treat the problems such as protrusion of the front of the maxilla, short upper lip, difficulty in lip closure, exposed teeth, high lower front teeth, crowded front teeth, second or third degree deep coverage, and inflammation caused by teeth biting the palatal side, neck or maxillary soft tissue.