This is the definition of a perfect smile in dentistry terms:

1. Proportion of Centrals (front middle teeth)

The width divided by the length of your upper two front teeth should be between 75% and 80% - ideally 77%.

2. Golden Proportion of Upper Front Six Teeth

On a two dimensional picture these teeth should have specific ratios when comparing the lateral upper teeth.

3. Midline and Arch Alignment

Your two front teeth should be in the middle of your face. The arch alignment should be perpendicular to the midline or parallel to your eyes providing your eyes are balanced.

4. Axial Inclination

All your teeth should be slightly inclined inwards as per the black lines shown in the picture

5. Incisal Edge Line vs. Lower Lip Line

If your lower lip has a pattern 1 character, then the upper teeth should follow along the upper lip.

6. Contact Points

These get progressively closer to the gingiva (gums) as the teeth go back.

7. Arch Form

If one was to draw a line through the centre of the cuspids, the line should bisect the incisive papilla. If this line is posterior to the papilla the arch form will be too narrow. If this line is anterior to the papilla the arch form will appear too flat in appearance.

8. Gradation

The teeth should appear to get shorter as one looks back.

9. Gingival (Gum) Symmetry

The gums on one side of your mouth should look exactly like the other side. When someone is smiling we should see no more than 3 mm of gum tissue.

10. Gingival (Gum) Contour

When a line is drawn from the gingiva of the cuspid to the gingiva of the central, the gingiva of the lateral should be 1 - 2 mm lower than this line.

11. Gingival (Gum) Zenith

The highest point of the gingiva should be just distal to the long axis of the cuspid and central teeth but should be right on the long axis with the lateral tooth.

" you do not have to be born with the perfect smile to have one "