Great I quite this habit almost a decade ago!

TIME

You do it while you’re reading emails or watching television; the tip of a finger creeps up between your teeth, and you nibble away for a few minutes before catching yourself. Your mom always told you it was a bad habit, and you worry about coworkers eye-balling your shredded digits. But is biting your fingernails actually dangerous?

“Yes, and for a number of different reasons,” says Richard Scher, M.D., an expert on nail disorders at Weill Cornell Medical College and a member of the American Academy of Dermatology.

To begin with, your nails harbor all sorts of germs. In particular, a family of bacteria called enterobacteriaceae — which includes salmonella and E. coli — tends to thrive in the cozy crevice beneath the tips of your nails, Scher explains. When you bite your nails, those bacteria end up in your mouth and gut, where they can cause gastro-intestinal infections that…

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