Overbites and underbites are two types of misaligned bites. Depending upon their severity, a person may need to undergo a procedure called corrective jaw surgery, also known as orthognathic surgery. An oral and maxillofacial surgeon (OMS) can correct a wide range of minor and major skeletal and dental irregularities, including the misalignment of jaws and teeth. Surgery can improve breathing, chewing and speaking. While the patient’s appearance may be dramatically enhanced as a result of the surgery, orthognathic surgery is performed to correct functional problems.