ProtectiveClean 6100 rechargeable electric toothbrush delivers up to 100% less stains in just 7 days to whiten your teeth in just 1-week vs a manual toothbrush. It has a pressure sensor that protects teeth and gums from excess brushing pressure. Brush heads wear out over time. Our BrushSync technology tracks how long you have been using your DiamondClean brush head and how hard you have been brushing. It will beep to inform you when to replace your brush head. Customize your own brushing experience with intensity settings and your choice of 3 modes: Clean, White and Gum Care. The easy-start feature slowly increases the power of the brush as you get used to the Sonicare experience and the smartimer encourages a full 2 minutes brushing time as recommended by your dental professional. The battery charge indicator light lets you know when it is time recharge 2 week battery life.