Shannon R., SELF magazine
Commuting. Living in a polluted city. You do some things despite the known side-effects. Another one: combing and brushing your hair. Even though it causes damage, most of us have got to do it (rather than face the very tangly consequences). But: you can make it less damaging. Here's the lowdown on the damage combs and brushes cause, and which ones are healthiest for hair.
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Brushes and combs inflict damage because hairs become "looped" around individual bristles. Once they are looped, the friction increases (translation: you have to pull harder) and the hair can be yanked out or broken.
A study in the Journal of Cosmetic Science compared hair breakage resulting from a paddle brush, a round brush and a basic comb (not a wide-tooth one). Brushing causes more long hairs to break, while combing does just the opposite: it produces more short broken hairs.
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It's too bad this this study didn't