The present invention aims to provide an orthodontic appliance capable of aligning teeth within a shorter period of time than usual without using braces including an orthodontic wire and brackets. This appliance is provided with a dental mouthpiece mountable on teeth and a vibrating element. The dental mouthpiece is so shaped as to apply a biasing force in an aligning direction to a tooth to be aligned in the teeth while being mounted on the teeth. The vibrating element is attached to the dental mouthpiece, generates mechanical vibration and applies the vibration to the tooth to be aligned, thereby activating the bone remodeling of a target tooth and an alveolar bone to promote an orthodontic effect.
