An orthodontic device (10) according to the invention having an orthodontic attachment (11) which includes an engaging portion (17) formed in a side portion of an archwire slot (16), and an orthodontic cap (13) mounted on the orthodontic attachment (11) while covering the whole of the archwire slot (16) and includes an engaging/receiving portion (22) extending in a direction perpendicular to a mesiodistal direction of the archwire (12) and engageable with the engaging portion (17). A method for mounting and removing an orthodontic cap which to facilitate the mounting and removing of the orthodontic cap with respect to the orthodontic attachment.
