Toothbrush invented in jail?

5.9.09
"William Addis of England is credited with creating the first mass-produced toothbrush in 1780. In 1770 he had been placed in jail for causing a riot. While in prison, he decided that the method for teeth brushing of the time – rubbing a rag on one's teeth with soot and salt – could be improved. So he took a small animal bone, drilled small holes in it, obtained some bristles from a guard, tied them in tufts, then passed the bristles through the holes on the bone and glued them. He soon became very wealthy. He died in the year 1808 and left the business to his eldest son, William II."

got this piece of information from wikipedia while searching for something. the girl showing the use of toothbrush is also awesome :).

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