Cheryl Cole, Tulisa, Zac Efron: Celebrity teeth before and after

One Direction's Niall Horan was busy showing off his brand new beaming white smile after having his braces removed this week (April 3).

The 19-year-old singer shared a before- and after-snap of his teeth, tweeting to his fans: "Morning! This is it ! I'm goin to the dentist! I think this is my last hour with braces! Oh how I'm gona miss them ! Naaaaaaat! (sic)."

So we take a look at other stars who've undergone dental work to create that perfect Hollywood smile - from Cheryl Cole to Zac Efron...