A toothbrush whose tufts comprise three distinct kinds of rows, with each row oriented transversely to the longitudinal axis of the head. The tufts of the first kind are the shortest. The endmost tufts on each row of the second kind tilt laterally outwardly by about 12 degrees. The tufts of the third...http://www.google.se/patents/US5335389?utm_source=gb-gplus-sharePatent US5335389 - Plaque removing toothbrush
