Click on the W2 Optimal White brush head to remove surface stains and reveal a whiter smile. With its densely packed central stain removal bristles, it's clinically proven to whiten teeth in just one week. You may not notice if you're brushing too hard, but your toothbrush will. If you start taking it out on your gums, the toothbrush will make a pulsing sound as a reminder to ease off the pressure.