A strut for use with an orthodontic retainer device, the strut comprising an adhesion surface for adhering the strut directly to a tooth, wherein the strut is shaped to form an arc defining a arcuate plane, and wherein the strut is shaped so that the adhesion surface is inclined relative to the arcuate plane, and wherein the strut has a length of at least 50 mm. A corresponding method of manufacture is also provided.