A series of preformed teeth aligners or positioners, worn in succession and changed every few weeks, designed to influence the shape and/or function of the stomatognathic system; often used to impact a patient's appearance and self image. It is typically custom-made using computer-generated modelling based on an initial oral impression, and a consultation with an orthodontist. It is typically made of a clear hard plastic, e.g., a thermoformed polycarbonate (PC). It is typically used to correct malocclusions such as underbites, overbites, cross bites and open bites, or crooked teeth and various other flaws of teeth and jaws, whether cosmetic or structural. This is a single-use device.