Dont ask us how sonic toothbrushes with such superior cleaning technology can be produced for such a great value price all we can tell you is that they work much more efficiently than others weve tested they buzz over your teeth at an amazing 22 000 strokes per minute far faster than normal electric brushes and not only clear surface plaque but also create waves of turbulence in your mouth tiny bubbles form in the space between the toothbrush and your teeth and these help to shift m