The Rembrandt Sonic Whitening Brush Heads are scientifically designed to remove stains from hard-to-whiten places. These brush heads are the perfect replacement for your Rembrandt Sonic Whitening Toothbrush, and are also compatible with most Philips Sonicare power toothbrushes. The Rembrandt sonic brush heads are designed to remove 20x more stains from the visible spaces between your teeth and 7x more plaque removal than a manual toothbrush. Featuring a large tuft design to cover more surface area and diamond shaped bristles to help polish away surface stains, these replacement brush heads are the perfect compliment to your teeth whitening routine. Plus, the color fading bristles remind you when it's time to replace your brush head.