Katy Perry brushes her teeth six times a day. The 27-year-old 'Part Of Me' singer apparently keeps 20 brand new toothbrushes close at hand because she is so scared of getting fillings. A source close to Katy told the Daily Star newspaper: "We won't go anywhere without a stack of brushes. "When she was a kid she had 13 cavities. So she now brushes her teeth six times a day.'' Katy - who split with Russell Brand after just 14-months of marriage in December - previously revealed her tooth-cleaning obsession was inspired by Britney Spears. In an interview with YouTube, she confessed: "I brush my teeth all the time. I wanted them to be, like, Britney Spears white. I used to grow up seeing her music videos and be like, 'What does she do? Does she get a new set of teeth all the time? They're so white'. "I'm really anal...