Although this new movie of McConaughey's seems a bit silly ... but as long as he's running around shirtless & all ... why not take advantage of that?
On the set of 'Surfer Dude', it seems Matthew McConaughey never put on a shirt or t-shirt! I mean, why would he?
But, he has been spotted doing the one thing that he cannot live without ... Brushing his teeth!
Matthew McCoanughey is known for his extremely white teeth ... although he's a 'cigar' smoker, he has manged to keep his teeth as white as the whitest thing you've ever seen!

He was asked once, i don't know was it on Oprah or with Barbara Walters, about how he keeps his teeth so white ... It turns out that Matt brushes his teeth at every chance he gets, after drinking or eating anything ... for about 10 minutes! That's a lot of brushing!

Check out photos of Matt McConaughey shirtless & brushing his teeth on the set of 'Surfer Dude' ...