The term symmetry was defined as the mathematical identity between the mirror images of the right and left halves of an object. However, it is rare for humans to have such mathematical symmetry in the craniofacial skeleton1. Robinson et al reported that a beautiful face should be harmonious with comparable size and position of the skeletal structures and soft tissues2. They stated that a favorable face can be shown by the soft tissues2. For patients with maxillofacial deformity, facial asymmetry is a common chief complaint, although patients might have other sagittal or vertical jaw imbalances concomitantly1. In contrast, facial asymmetry might be masked by severe facial skeletal imbalance, dental malalignment, soft tissue compensation, or tilting of head posture1. The documented prevalence of facial asymmetry ranges from 21% to 85%1. Usually the structures of the lower face are more asymmetric than those of the upper face1.