Keeping up good brushing habits is tough. Series 7900 will guide you between dentist check-ups. Know when to adjust your pressure with built-in smart sensors and use the App's Progress Report to help you stick to your brushing routine. 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 is clinically proven to whiten teeth in just one week. Densely-packed, high-quality bristles remove up to 7 times more plaque than a manual toothbrush. You might not notice if you're brushing too hard, but your Series 7900 will. If you need to ease off, the toothbrush will make a pulsing sound. It's a reminder to let your brush head do the work. Smart brush heads ensure that you are using the right mode and intensity for the best possible clean. For example, if you are using the G3 Premium Gum Care brush head, your Series 7900's BrushSync technology will automatically sync your brush head with the Gum Health mode to help give your gums a clean bill of health. Series 7900 comes with Clean, White+, Gum Health and Deep Clean+ to take care of your brushing needs. Clean mode is for exceptional everyday cleaning, White+ is for removing stains, Gum Health provides a gentle yet effective clean for gums and Deep Clean+ gives you an invigorating deep clean. Three intensities allow you to choose between a higher setting to boost your clean and a lower one for more sensitive mouths. Your Series 7900 will last for up to two weeks on a single charge with regular use. Box includes: - Philips Series 7900 Handle - Philips W2 Optimal White Brush Head x 4