Abstract: A generally semi-elliptical shaped wafer of a light weight material having upper and lower surfaces that may be pressure gripped between the bracket supporting teeth of an orthodontic patient, with the material being one that permanently deforms when substantial pressure is applied thereto, and as a result each wafer when subjected to such gripping having impressions formed therein that record the relative positions of the brackets and the teeth associated therewith. By using the wafers successively on patient visits to an orthodontist, a permanent record is maintained of the progress being made in straightening and aligning the teeth of each patient, or other corrective orthodontic work. In addition, the impressions of the brackets on the wafer indicate to the orthodontist the extent to which the arch wire must be bent or deformed to exert a desired force on the teeth for further corrective procedures.