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Dear Hank and John and Roman
99% Invisible
Tooth Brushes
For a long time, tooth brushes were really skinny. The big innovation in a tooth brush design was like the reach tooth brush in the seventies than that was angled,. And then much later on, with the they came up with the fat handle tooth brush because they realized that sort of hand kennist, theseologists felt that tooth brushes were too narrow.
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