Believe it or not, Zac wasn't always a hunk. He went through some pretty awkward teenage years. But that all paid off because he's not too hard to look at these days — especially when his shirt's off. Suh-woon.
You'll be surprised to see which A-listers didn't always have a pretty smile.
Check out the stars who put their money where their mouths are — and fixed up their not-so-perfect teeth.