SAHARA star Matthew Mcconaughey is obsessed with cleaning his teeth - and even keeps a toothbrush in his car. The Hollywood heartthrob, 38, admits to placing toothbrushes in strategic places throughout his home in case he is caught out by his dental hygiene habit. He says, "Toothbrushes. Has anyone ever told you that you're brushing your teeth too often? I've never heard of that. "I have a toothbrush in my car, in my bedroom, bathroom, kitchen. I have them all over the house, I brush all the time - I figure you can't do it too much."