I figure they do re-touch those pics.
OK. You know this kind of conversation WILL call for me to answer, right?
You know I'm the one geek to be unable to skip it, right?
There is no way that those two lateral incissors can go front and back from one pic to another (except if they were fake... hahaha!) especially when the pictures with "perfect upper teeth" are older than the one with crooked ones.
(We could assume, if it were the other way around that he had gone under orthodontic treatment... although that's quite unlikely given the fact that hyde is very popular, very exposed, very vain XDDD and he wouldn't let his fans see him wearing braces. XDDD)
Another method (other than orthodontics) would be working on the front part of the tooth, so that when he smiles it looks like those teeth are straight-white-perfect-pearly-godblessed,
but from the pictures above we can see nothing like this has been done (or those l.i. would be abnormally thick.)
On a side note... I can see he has fillings in his upper molars. XDDDD
Oh, and btw, since I'm at talking about teeth...
Just because the thread forces me to say this:
Magazines promoting miracle dental-work also do this kind of "picture-tweaking"; so don't believe every ad you see promoted as a wonder of science. Consult your dentist first.
I know this is so OOC, but I can't help issuing some unnecessary piece of advice here. m(_ _)m
XDDD (See????? Sometimes I can even sound pro and serious! XDDD)