© Getty Images

George Clooney -

Porcelain veneers and crowns have made George Clooney's teeth larger and whiter, and helped broaden his smile.

© Getty Images 

50 Cent -

When isn't 50 Cent smiling? Well, he wasn't so much before he had the gap between his teeth reduced. And a new set of veneers wrapped the job up, so to speak.

© Getty Images 

Victoria Beckham -

It has to be said that Victoria Beckham doesn't smile much, even though she's rumored to have spent US$45,000 on teeth whitening and veneers.

© Getty Images 

Joe Biden -

The President of the United States positively shines from the podium. Maybe it's because Joe Biden's smile is worth an alleged US$20,000 of dental work. 

© Getty Images 

Zac Efron -

Back in his teens, Zac Efron wore removable braces to reduce the gap between his teeth. Today, they look suspiciously more white than they used to.

© Getty Images 

Miley Cyrus -

As a youngster, Miley wasn't so style conscious. But the starlet quickly became aware of her not-so-perfect teeth. A makeover corrected her rather prominent front teeth, while the bottom set were straightened out.  

© Getty Images 

Nicolas Cage -

His smile is one of the brightest in the business, but there was a time when Nicolas Cage tried to keep his teeth under wraps. That was until he decided to replace a crooked grin with a neat row of pearly whites.

© Getty Images 

Tom Cruise -

Tom Cruise achieves his signature grin by virtue of some handiwork by a skilled orthodontist who realigned his teeth. Mission impossible it wasn't. Clear braces worn for the next 18 months or so rounded the procedure off.

© Getty Images 

Gwen Stefani -

Gwen Stefani was quite proud of her "tin grin" during the years she wore braces. Eventually, however, she made the choice to correct her smile, with a set of shiny new veneers.

© Getty Images 

Ben Affleck -

According to Kate Beckinsale, director Michael Bay insisted Ben Affleck replace his "baby teeth" with a more masculine set. Apparently in 1998 the producers of 'Armageddon' forked out US$20,000 to get Affleck fitted out with a new set of larger and stronger pearly whites.

© Getty Images 

Cristiano Ronaldo -

You don't have to be a movie star to acquire a glamorous smile. Portuguese soccer star Cristiano Ronaldo scored big time with his new teeth.

© Getty Images 

Jon Bon Jovi -

The UK's Guardian newspaper once described Jon Bon Jovi's pearly whites as "superstar teeth." But as the rest of him ages, albeit rather gracefully, those same teeth remain suspiciously shiny and new.

© Getty Images 

David Bowie (1947–2016) -

For many years the late, great David Bowie ignored his higgledy-piggledy nashers. But at some point during the 1980s, the "thin white duke" opted for a serious mouth makeover. And it worked!

© Getty Images 

Demi Moore -

Demi Moore had her smile transformed with a set of new porcelain crowns and veneers.

© Getty Images 

Michael Douglas -

Michael Douglas has matured like a fine wine. But wine can stain teeth. So he had them whitened and straightened to create a wonderfully symmetrical grin.

© Getty Images 

Chris Rock -

Chris Rock's mouth makeover reportedly cost US$150,000. That's a lot of bucks for new teeth!

© Getty Images 

Celine Dion -

Before hitting the big time, Celine Dion had her teeth capped, ostensibly to cover her oversized incisors.

© Getty Images 

Nicole Kidman -

In her younger days, Nicole Kidman was not very happy with her bright but slightly buck and gummy teeth. Not anymore!

© Getty Images

George Harrison (1943–2001) -

It was only towards the end of his tenure as a Beatle that George Harrison did something about his wayward teeth. You can see the results on the front cover of the 'Let It Be' album, where he shows off a supersized grin.

© Getty Images 

Cher -

According to one Hollywood dentist, "Cher had her teeth orthodontically moved out to give her lips more support."

© Getty Images 

Noel Gallagher -

Back in the 1990s when Oasis was one of the biggest bands in the world, Noel Gallagher didn't care too much about the way his teeth looked. But older, wiser, and richer, the guitarist struck the right cord and sorted his teeth out.

© Getty Images 

Hilary Duff -

The story goes that Hilary Duff opted for a full set of veneers after chipping a tooth on a microphone.

© Getty Images 

Colin Firth -

Colin Firth looked perfect as Mr. Darcy in the 1995 British television drama 'Pride and Prejudice.' But that's after he opted for a set of new teeth. Mind you, he broke one of them years later while filming 'Kingsman: The Secret Service' (2014).

© Getty Images 

Emma Watson -

It's hard to believe that Emma Watson was only nine years old when she was cast in the first 'Harry Potter' film. As filming progressed, she lost a few baby teeth, which, as if by magic, were replaced by dentures to keep Hermione's smile bright and perfect.

© Getty Images 

Simon Cowell -

Haven't Simon Cowell's teeth got talent? In fact, when he smiles the entertainment mogul stands out from the crowd.

© Getty Images

Katherine Heigl -

The 'Grey's Anatomy' star has in the past admitted to wearing Invisalign clear braces. These days she maintains her gleaming smile with a retainer, which she replaces every two weeks or so.

© Getty Images 

Clark Gable (1901–1960) -

Legendary Hollywood heartthrob Clark Gable lost all his teeth at 32 due to gum disease. He wore dentures for the rest of his life.

© Getty Images

Snooki -

'Jersey Shore' cast member Nicole Elizabeth LaValle, better known as "Snooki," rewarded her newfound fame by wearing a full set of lumineers (a less costly version of traditional veneers) to ensure that her smile was camera perfect.

© Getty Images 

Keyshia Cole -

A gap-tooth problem was something Keyshia Cole had to sort out sooner rather than later, and she did so while at the same time giving her teeth a bright white makeover.

Sources: (Glamour Magazine) (The Hollywood Reporter) (Chicago Tribune)(SD Smile)

See also: Celebrities who regret their plastic surgery and other aesthetic procedures

© Getty Images