A removable orthodontic device includes an anchorage cap segment, a movingcap segment, a pair of spring elements, and a guiding wire. The anchorage capsegment is removably worn on the anterior teeth of a dental arch. The movingcapsegment is removably worn on at least one posterior tooth on one side of thedentalarch. The spring elements are disposed between the anchorage and moving capsegments to generate an elastic resilient force to move the moving cap segmentrelative to the anchorage cap segment. The guiding wire has a U-shaped portionandtwo rod portions. The U-shaped portion is embedded in and disposed aroundthreesidewalls of the moving cap segment, and the rod portions are received inguidingchannels formed in the buccal and lingual sidewalls of the anchorage capsegment toguide the movement of the moving cap segment.
