The best time to perform orthognathic surgery for the correction of dentofacial deformities is the first time. However, complications requiring reoperation do occur. A thorough understanding of how to avoid intra- and postoperative complications, and how to manage these problems successfully, is mandatory. This article discusses some of the most common complications, how to avoid these complications, and how to treat complications when they do occur. General surgical complications during and after surgery, such as hemorrhage and infection, are outside the scope of this article.