When it comes to celebrity teeth, some have changed dramatically over the years.
Whether these stars have had braces, experimented with whitening or gone all out with veneers, they've totally upped their look with a trip to the dentist.
Take a look at the most amazing mouth makeovers in showbiz...
1) David Beckham
From wonky to wonderful.
2) Cheryl Fernandez-Versini
It's hard to believe Chezza was ever less than polished, right? But she had a pretty different look in her Popstars: The Rivals days.
3) Hilary Duff
Surely one of the most sparkling smiles in Hollywood?!
4) Matthew Lewis
Thanks to the Harry Potter actor's incredible makeover, the verb 'Neville Longbottom-ing' is now officially a thing.
5) Tulisa Contostavlos
Back in 2011, Tulisa confirmed that she'd had work done on her chompers with the Tweet: 'their [sic] amazing so happy with my result x.'
6) Ronan Keating
7) Cher Lloyd
On her new look, the X Factor lady's said: 'It's changed my life completely. I smile more than ever.
'I never used to smile in pictures before, and if I did it would be a tiny bit to one side because that used to be my good side. Now I have good sides every side of my mouth.'
8) Catherine Zeta-Jones
These pearly whites helped Catherine dazzle Hollywood.
9) Niall Horan
The One Direction lad wore braces in the band's early days - and it was definitely worth it.
10) Kate Beckinsale
Um. Please may we have your dentist's number, Kate?!
11) Rylan Clark
The Celebrity Big Brother winner isn't bothered if others don't like his veneers, declaring in 2015: 'People took the p*ss, but f**k them all. I’m over the moon with my teeth.'
12) Joey Essex
Potentially the whitest teeth we've ever seen.
13) Nicola Roberts
14) LeAnn Rimes
Bye bye, gappy grin!
See: Adult Braces: Our Guide
15) Miley Cyrus
Miley's style has evolved dramatically since childhood, but nobody can deny that those chompers are winners.
16) Nicolas Cage
What a difference some whitening can make.
17) Kendall Jenner
The stunning model had braces as a youngster, so her awkward pre-teen phase is a distant memory.
18) Zac Efron
Let's be honest, Zefron would be a heartthrob whatever he did with his pegs.
19) Morgan Freeman
Because you're never too old to freshen up your look.
20) Mel C
Yep. That gold tooth really was cool in the 90s.
21) James Arthur
He's definitely got The X Factor now.