A mathematical progression of numeric expressions thought to have ideal esthetic value. It describes the ideal dimensions and visual relationships of the human dentition, as well as human facial dimensions. Dr Eddy Levin, of London, England, found that by applying the Golden Proportion to the eight maxillary anterior teeth (1st bicuspid to 1st bicuspid), ideal esthetics could be achieved. The ratio is 1.618 to 1. It has been accepted that the Golden Proportion exists in natural dentitions as observed from the labial surfaces, the ratio of the widths of cuspids to lateral incisors as well as central incisors to lateral incisors. The four front teeth, from central incisor to 1st bicuspids, are the most significant part of the smile and are in Golden Proportion to each other. Also, the combined width of the central incisors compared with their height follows the Golden Proportion.