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http://thebeautybrains.com/2009/03/24/have-you-ever-heard-of-a-dry-shampoo/
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http://www.doublex.com/section/health-science/do-you-really-have-wash-your-hair-0?page=0,1
http://health.howstuffworks.com/skin-care/scalp-care/tips/dry-shampoo.htm