Proper prediction of the postoperative soft tissue profile is necessary for accurate diagnosis and treatment planning in combined surgical orthodontic treatment. As indicated by many studies, improvement of the facial profile provides physical and psychological benefits, including desirable changes in aesthetics, increased confidence and improvements in emotional status and social skills. This book comprises of evolution of orthognathic surgeries, types of mandibular osteotomies, principles and soft tissue changes following mandibular osteotomies.