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Evolution and Analysis of the Toothbrush
"This article looks at the origin and evolution of modern toothbrushing" from the toothstick to toothbrushes with angled heads and nylon bristles. From the ASME Mechanical Advantage, a journal from the American Society of Mechanical Engineers (ASME).
http://www.asme.org/NewsPublicPolicy/Newsletters/METoday/Articles/Evolution_Analysis_Toothbrush.cfm
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