Makeup & airbrushing are the 2 biggest things in the entertainment industry - it's done to everyone - everywhere - in the media, regardless of who you are. As said above "no one is perfect..." but then again... what is perfection?...
Honestly I don't believe she's had anything done... she's grown alot since those early pic's, looks exactily the same to me minus a lil bit of weight. Also... if you watch her tv performance's you will notice that she wear's a clear strapped push up bra alot (even with shoulderless tops) which accounts for the "growning boob's" (that just sounds stupid even explaining it lol). As with Ayu's teeth... the camera used (video or conventional) and the angle being shot make's a difference as well, if you've seen the interview on "Hamasaki Ayumi" or even the pre PV clips you can see this.. as her teeth look as they did in her teen years. (I'll grab some screencaps when I have some free time)
What it all comes down to is this...
When your as big as Ayu is your going to have people who don't like you... hell I have people that don't like me and well... I'm just me lol. Comes with the territory. People have there opinions and that's there right as humans. Dosen't matter what "they" think - We all love Ayu and that's all that matters!
Back to the "perfection" issue again for a sec...
My personal view of Ayu is that of perfection - but these are my eye's and that's how I choose to see her - no amount of banter will ever change that.
Seriously though I herd her music a good while before I seen a photo of her, and fell in love with it immeaditly (and the music is what matters right?). Looks are no substitue for talent anyway... and Ayu just happens to have both
Anyway's... sorry for the long post.
Peace and love to everyone.