Method of self determining the degree of fit of an orthodontic aligner by a patient with the patient's teeth

A composition of matter for monitoring the degree of fit of an aligner among a series of aligners defining a corresponding series of tooth positions comprising a nontoxic colored plastic material for disposition into a selected aligner which is pressure moldable at room temperature to the patient's teeth into the selected aligner and which is removable from the selected aligner from the patient's teeth without substantial adherence to the teeth, the nontoxic colored plastic material being translucent so that the amount of material disposed onto the interior aligner's surfaces indicates by visual inspection of the material disposed therein of the degree of fit of the aligner to the tooth positions, a good fit being indicated by a minimum of material extruded onto almost all of the interior aligner surfaces and by a light color, and a poor fit being indicated by an excess of material extruded onto one or more locations of the aligner interior surfaces and a dark color.