Philips Sonicare Advanced Whitening Edition Rechargeable Electric Toothbrush. This toothbrush features 4 modes and 3 intensities to personalize your brushing experience. It also includes a gum pressure sensor to help protect your gums. Keeping up good brushing habits can be tough, but the Series 7900 is designed to guide you between dentist check-ups. Built-in smart sensors alert you when to adjust your pressure, and the App's Progress Report assists you in maintaining your brushing routine.