Wow! Check out Justin Bieber's smile and Big Time Rush member James Maslow's grin. Both of these guys have amazing smiles, but who do you think has the better grin when they're matched up side by side?

Oh, Bieber. When 'U Smile,' it just makes our hearts melt. He's such a good-looking guy to begin with, that when he flashes his pearly white choppers for the camera, it's practically swoon-inducing. Selena Gomez certainly couldn't resist that adorable smile, and Beliebers certainly can't either!

But wait! Bieber's got some seriously stiff competition in the form of Big Time Rush singer James Maslow, who has one of the infectious smiles we've ever seen. His smile is just so warm and natural, that we bet all of you Rushers catch yourself just grinning at the sight of it. And just look at those perfect teeth! Someone's orthodontist deserves a gold medal...

Does Bieber have your vote for best smile? Or will Maslow win the most votes with his glorious grin? Cast your vote below! And remember, Beliebers and Rushers, you can vote once per hour!

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