I think that teeth are one of the things that people are most self-conscious about. It's an obsession that I would have to guess originated in the US but is continually spreading, so when I have a client that decides not to smile in pictures because of their teeth, I try to assure them that they can have a beautiful smile post-photoshop.
How It's Done (Click on the images for larger jpegs):
1: Straighten the teeth using the liquify filter.
2: Mask the selection of the teeth (using quick mask or regular mask - use a soft edge).
3: With the teeth selected, go to the Hue/Saturation (Apl U) window. Select the Yellow from the drop down menu and decrease the saturation of the yellow.
4: With the brighten slider bump up the lightness of the teeth a tad to make them look better.
5: De-select the teeth (Apl D).
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