All this controversy over some little white string? Dmytro Panchenko/Thinkstock My French roommate Julie had just come into the bathroom to get something. “What are you doing with that string in your mouth,” she said, with a look of horrified surprise. It turns out she had never seen floss. We were both in our 20s, and my dentist had spent over a decade instructing me to floss, so I was a little h
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