This creation is an attachment device for orthodontics, which includes a base, an extension rod, a first curved hook, a first rod, a second rod, and a second curved hook that are integrally connected in sequence. The base has a fixing portion for fixing to a tooth. The first bending hook has a first concave portion and a first constriction portion. The extension rod is interposed between the first concave portion and the base, the first rod is extended from the first constriction； the connection point between the second rod and the first rod forms a central vertex； the second curved hook is formed by the second rod It extends out and has a second concave portion and a second constricted portion. Therefore, this case has the advantages of small size, easy installation of the elastic ring body, less skew or rotation during orthodontics, and the ability to apply force below the gums.本創作係為一種牙齒矯正附件裝置，其包括先後一體連結之一基座、一延伸桿、一第一彎勾、一第一桿、一第二桿及一第二彎勾。基座具有一固定部，用以固定於一牙齒。第一彎勾具有一第一內凹部及一第一縮口部。延伸桿介於第一內凹部與基座之間，第一桿係由第一縮口部延伸出；第二桿與第一桿連接處形成一中央頂點；第二彎勾係由第二桿延伸出，並具有一第二內凹部及一第二縮口部。故，本案兼具體積小且便於裝設彈性圈體、牙齒矯正時較不易歪斜或旋轉，及可於牙齦以下施力相當特別等優點。
