Opinions of white and not white enough vary from person to person, as does the effectiveness of bleaching products. Some people simply don't get much change in color from bleaching.
When I have done smile makeovers for models or pageant contestants, it almost seems as if there is no such thing as too white. With the bright lights shining and camera lenses doing what they do, the smiles that look natural in daily life don't look as nice.
Usually, this level of white cannot be achieved by bleaching products and are actually porcelain veneers. All whitening of natural teeth is temporary, so if a result was too white, if given enough time the smile would rebound to something more normal. Having said that, I have never bleached a smile and had someone complain that it was too white.
If you are a person that is modeling or on a stage of any kind, very white teeth may be good for you. MOST people are not, so a less white, softer coloring would be more natural. For some people, the bright, unnatural look is what they want.
A lot of the natural appearance of veneers is from the dentist using a talented lab. Natural teeth are more than one color, a blend of yellows and whites. Even veneers that are unnaturally white, when blended by a talented ceramist, can look very natural. When you see a monochromatic chicklet smile, you can bet that it was not done by a highly skilled ceramist.
