Are your teeth sized in the proper proporton? The Golden Proporton follows the “rule of thirds”. Each tooth away from the midline should be two-thirds as wide as the previous tooth. For example: Measure the width of a central incisor in your mouth or on a photograph. Divide this width by the width of the lateral incisor next to it. The central incisor should be 1.6 tmes as wide as the lateral, and the canine 0.6 tmes as wide as the lateral, and so forth. (Example: Ideally, if the central incisor is 10 mm wide, the lateral incisor should be two-thirds of this amount, or about 6.5 mm, and the canine should be two thirds of that or about 4.4 mm