This present invention provides an orthodontic aligner installed on a user's teeth which includes a target tooth and an anchor tooth, the orthodontic aligner comprising a shell having a space constructed by receding of the shell, and a recess formed by recessing from one side of edge of the shell, and an extension formed by protruding from another side of edge of the shell, wherein the recess is located corresponding to position of the target tooth and the extension portion is located corresponding to position of the anchor tooth. This present invention also provides an orthodontic aligner assembly and manufacturing method therefor. So, only the target tooth needs to be moved will be moved during orthodontic treatment processes which can reduce sequels and the target tooth could make a predictable and long distance movement because of the recess without changing aligner frequently.
