BECAUSE YOU DON’T FLOSS ENOUGH! The real reason could be due to improper flossing technique. If you are “popping” the floss in and out of the space between your teeth you may be doing damage by going too deep or using too much pressure. The correct technique according to my dentist is to slowly press and work the floss in there and scrape the sides of the teeth with it. This dislodges buildup and can disrupt microbial colonies.
Edit: the first line is a joke
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