Fuente: Wipo "Sensorization" Inventions herein include at least mostly optically clear orthodontic aligners and orthodontic retainers (collectively referred to as “appliances”) with backscatter based sensors. The given appliance must be correctly custom manufactured to fit a patient's own particular geometry and dimensions of their teeth and/or mouth in order to perform as intended. Incorporating such appliances with backscatter based sensors enables simple, easy, fast, efficient, and cost effective measurements, in real-time or near real-time, of stresses, forces, structural changes, and/or the like in the given appliance; which in turn can aid in determining if adjustments or re-manufacture of the appliance may be needed or desired; and/or wherein such measurements may aid in evaluating performance of the given appliance. In some embodiments, such measurements may also be taken remotely away from a practitioner by a patient's own smartphone and/or smartwatch; and then communicated to a remotely located practitioner.