Apparently, using dental floss can be dangerous. Just ask Robert Pattinson.The Twilight hunk supposedly chipped his tooth making sure he had healthy gums and could properly deny reports of being stinky, according to Eclipse costar Bryce Dallas Howard."Actually, he's incredibly hygienic," the actress told New York magazine at the premiere of her latest film, The Loss of a Teardrop Diamond. "He told me this story that made me crack up. He was like, 'Oh, I have to go to the dentist.' And I was like, 'Oh no, what happened Just a checkup' And he was like, 'No, I chipped a tooth.' And I was like, 'How' And he was like, 'Flossing.'"Before she could be handed an award for storytelling, she admitted, "I don't even floss. So he's hygienic. Trust me."And there you have it.We're not sure if we're hoping he gets to tooth fixed or if he keeps it to be edgy a la Brad Pitt in Fight Club.