Aw, Josie, dental work is supposed to make you look better not worse. Maybe you just aren't used to the change yet. I'm sure you don't look ugly when you smile, I know people with very bad teeth who still look warm and sweet when they smile, it's the heart behind the smile that makes it beautiful.
As for aging in general, that happens to even the best people in the world, it isn't punishment, it's nature. Maybe God wants us to work on our character more as we prepare our souls for Heaven.