Patent 7389557 was granted and assigned to Colgate-Palmolive on June, 2008 by the United States Patent and Trademark Office.
An electrically driven toothbrush has a brush holder that is arranged to rotationally vibrate and carry a number of bristles interspaced with arcuate membranes. The membranes serve to aid cleaning of the teeth and to polish the teeth surfaces during use of the toothbrush.