The beauty and harmony of the face is highly related to the appearance of the teeth and their relations with each other, andwith the lips and other parts of the face. Orthodontic clinic is the place where such relations are being considered with the aim of achieving the highest level of beautiful smiles and harmonious faces. But good appearance is not the only important goal of orthodontic treatment, where the appropriate functions of the teeth, tongue, muscles and bones are considered as a main interest along with the good appearance.