Review (1/5): Useless Junk. Save Your Money
When I try out a new electric toothbrush, I test it by using disclosing tablets. Using them, you can see the plaque on your teeth, and measure how much your brush leaves behind. This brush removed absolutely nothing. It's exactly like a standard manual toothbrush that buzzes.
The bristles on sonic toothbrushes vibrate in an up and down motion at high speed. They don't move far, but the speed they're traveling at allows them to scrub the surfaces of your teeth very efficiently. My old Sonicare (purchased before Philips bought them out) left NO plaque film behind.
Curious about the Oral-B's non-effectiveness, I held the bristles lightly against my tongue, and could feel no motion whatever. It's as though the handle vibrates, but the bristles remain stationary.
Fortunately, the brush is inexpensive, so I won't feel too bad about throwing it in the trash.