To me, it's not the whiteness. So many people have white teeth now, thanks to the drugstore.
I find his teeth and many like him, to be sitting wrong in his mouth. They're a bit thick or something. Too perfect and something is unnatural with the gum line.
I don't know why, but some celebrities have gorgeous veneers that look fabulous in their mouths and many others, like A Rod, have teeth that look like dentures.
Is it the ability of the dentist or the natural teeth of the patient that doesn't make the most realistic fit.