OK. The double line feature seems to make sense. head angle; However, this makes it impossible for me to brush my back molars. To make matters worse, the floss is a thin thread - probably cotton - and on mine it frays and then breaks easily. If you have widely spaced teeth, these dental flosses will likely work for you. I'll give dental floss another try, which is made of a plastic that's advertised as "sliding" between teeth rather than fraying and tearing.
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