Unatural white teeth

Sometimes an occurrence will grab my attention.  Perhaps because it is out of place, unusual, or maybe because it repeats itself.  Recently this has happened to me while watching TV.  I have  seen broadcasters who have unusually white teeth.  These teeth are so white it looks like they have come out of a washing powder commercial.  My eyes squint when I see them.  Worse of all, they are so unnatural.  There are very few people in the world who actually have naturally occurring white teeth, the reality is teeth are varying shades of  pale beige, or even yellowish.  Whilst black skinned people may appear to have teeth which look whiter, this could be from two factors, one genetics and two contrast.  The contrast of seeing teeth against black skin makes them appear whiter than they actually are.  If you see an old movie, the actors have perfectly kept teeth but not necessarily white, just well looked after.  Like they had just been to the dentist for a scrape and polish.  This is acceptable as standards of oral hygiene have improved over they years.  But white teeth is abnormal.  People who have artificially white teeth do look out of place and on TV a warning should come with them, advising the view to put on the sun glasses.