Orthognathic surgery is also known as corrective jaw surgery. It is used to treat a variety of facial and jaw abnormalities in which the facial bones and teeth are not properly developed. This results in difficulty with chewing, speech, and jaw function. In many cases, the facial appearance is affected by this problem. Orthognathic means "straight teeth", and orthognathic surgery corrects these jaw and facial deformities, usually in conjunction with an orthodontist, so that after the jaws are corrected, the teeth. Sometimes, braces alone can correct a problem with the bite, but when it is severe, usually orthognathic surgery is required. Abnormal jaw and facial development can be genetic or acquired due to disease or injury. When the jaws are not properly developed or proportioned, problems such as difficulty chewing, jaw and facial pain, speech abnormalities and dental problems can result. Using sophisticated surgical techniques, the facial bones can be repositioned in order to restore proper function and facial appearance.