Click on the W2 Optimal White brush head to remove surface stains and reveal a whiter smile. With its densely packed central stainremoval bristles. BrushSync replacement reminder tracks how long you've, been using your brush head for, and how hard, you've been brushing so when it's time to, replace it, a light on your handle and a short. Safe & gentle on sensitive areas, orthodontics & dental work. it's clinically proven to whiten teeth in just one week. Lets you know when you're pressing too hard the toothbrush will, make a pulsing sound as a reminder to ease off, on the pressure Philips Sonicare's advanced sonic technology pulses water between teeth, and its brush strokes break up plaque and sweep it away for an exceptional daily clean