An orthodontic device includes a generally U-shaped metal wire whose two ends are at different vertical heights and which therefore has a 3-dimensional recumbent S shape in front view. The U-shaped metal wire is secured, by an elastic band or a cover, to each of a plurality of orthodontic brackets cemented respectively to a patient's teeth, and due to the difference of height between the two ends of the U-shaped metal wire, a resilient restoring force is generated to individually adjust the row of teeth on the upper or lower jaw to the normal heights and thereby correct the occlusal cant and craniofacial anomalies.