Three modeling plastics accurately reported their polymer type (Table ). Only one of the plastics advertised for oral prosthetics specified their polymer type (Table ). Two plastics, including one sold for dental applications, were incorrectly specified as PCL by the manufacturer; these misreported plastics were determined to be TPU (Figures ). We suspect that the products identified as TPU are polycaprolactone-based TPUs in which a polycaprolactone polyol was used as the chain extender or soft segment in the TPU. This may explain, to some extent, the misreporting and incomplete reporting of the materials underlying these products. Regardless, without detailed chemical analysis, distinguishing whether a product is TPU or PCL is infeasible, leaving consumers largely uninformed about the materials they are buying and potentially putting in their bodies.