Robert Pattinson chipped his tooth by flossing it so hard.

The "The Twilight Saga: New Moon" heartthrob is said to be so keen to dispel rumors he has bad personal hygiene, he damaged one of his gnashers by cleaning them so thoroughly.

His co-star for the next film in the "Twilight" franchise, "Eclipse," Bryce Dallas Howard, said he confessed to her.

She said: "He was like, 'Oh, I have to go to the dentist.' And I was like, 'Oh no, what happened? Just a check-up?' And he was like, 'No, I chipped a tooth.'"

"I was like, 'How?' And he was like, 'Flossing.' Who does that? I don't even floss. So he's hygienic. Trust me."

Last year rumors spread from the set of "Twilight Saga: New Moon" that British actor Robert doesn't wash often enough.

A source said: "He stinks. I mean, it's awful. He never showers, and it drives people on the set crazy. He completely reeks."

While Bryce dispelled such rumors, she added she was daunted by meeting the 23-year-old actor, who portrays vampire Edward Cullen in the "Twilight" franchise, but he helped her overcome her fears.

She added to New York magazine: "I actually came out to him that I was totally nervous about meeting him. He's such a sweet young man, and there's such a distinctive difference between him and Edward Cullen."

"He does such a wonderful job embodying that character, and bringing that character to life. But when you meet him, he's such a down-to-earth, humble person, you feel bad freaking out around him."