An orthodontic aligner tray includes a plurality of tooth-shaped cavities configured to adjust alignment or position of at least one tooth in the mouth of a patient. An apparatus to retain the orthodontic aligner tray to teeth of the patient includes the aligner tray including the plurality of tooth-shaped cavities, a retention feature securing the aligner tray to the teeth of the patient, and an adhering agent connecting the aligner tray and the retention feature. The retention feature includes a single contiguous retention feature aligned to a space between two adjacent teeth and spanning from a lingual gingival margin to a labial gingival margin.
