A perfect smile is the one that you feel confident and just love to smile! Beauty and perfection are in the eyes of beholder, and it is not like a piano keys, It does reveal perfecta imperfecta, and usually is very pleasing to the wearing it. The color, shape, the alignment all matches the patients face shape, skin tone, and the white of the eyes, and especially the lips. In nature Da Vinci golden ratios can be instrumental in designing a perfect smile.