An orthodontic appliance includes an arch wire formed on a trajectory corresponding to an aligned dentition of the lower or upper dentures and installed on the lip side or the tongue side of the dentures. An anchor bracket is fixed on both side molars of the upper or lower dentures, and detachably anchors the arch wire. An adhesive formed in a gel state is cured after being applied to the teeth surface of teeth to be aligned. The adhesive covers the arch wire installed on the anchor bracket to allow the arch wire to move when the teeth to be aligned move. The orthodontic appliance can be easily installed by applying, to the teeth surface, the adhesive covering the arch wire after installing the arch wire in a mouth and can protect the teeth from cavities by applying the adhesive to the teeth surface without existing brackets.
