When your job is to smile for the cameras all day, a good set of teeth is a must, which is why a whole bunch of celebrities including Cheryl Cole, Tulisa, Katie Price and Chantelle Houghton have all opened wide and said 'aaaahhhh' to get the perfect pearly whites.

Well, it is called a Hollywood smile for a reason.

Check out these stars who have had their teeth done in our before and after gallery.

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  • Nicola Roberts

  • Tulisa

  • Tom Cruise

  • Cheryl Cole

  • Chantelle Houghton

  • Louis Walsh

  • Katie Price

  • Rylan Clark

  • Cher Lloyd

  • Simon Cowell

  • Nial Horan

  • Ashleigh Butler

  • Amy Childs

  • 50 Cent

  • Miley Cyrus

  • Ronan Keating

  • Victoria Beckham

  • Catherine Zeta-Jones

  • Zac Efron

  • Nicole Kidman