In aesthetic treatment, what should the width of the lateral incisor be as a percentage of the central incisor width?

The golden proportion principle in dental aesthetics states that the width of each successive tooth (as seen from the front) should be approximately 60% of the adjacent tooth to its front. Therefore, the lateral incisor should appear to be approximately 60% of the width of the central incisor. This creates an aesthetically pleasing, harmonious smile. The central incisor is the widest anterior tooth (100%), the lateral incisor approximately 60%, and the canine approximately 36% of the central. This guideline is used in smile design and veneer/crown treatment planning.