Grooming: History of the Toothbrush

"The ... article on the evolution and analysis of the toothbrush was written by Kyle Sembera, a mechanical engineering senior at Lamar University, Beaumont, Tex., as a final assignment for an elective design class. Sembera=92s toothy research project was inspired by course professor P.R. Corder who, during a recent visit to the dentist, found himself musing on the merits of modern toothbrush design." - from the website. <http://www.asme.org/mechanicaladvantage/March2001/toothbrush.html>