Before using it, you need to rinse your mouth to remove some large debris in your mouth, and then use liquid toothpaste or foam toothpaste to inject it into your mouth or around your toothbrush head. The U-shaped toothbrush head is made of food-grade silicone antibacterial material. Ordinary toothpaste needs to wet your toothbrush head first, and then put it into your mouth. The upper and lower teeth are gently contained on the alveoli, and then start the s . touch the left and right fangs by shaking it left and right with your hands. 360-degree omni-directional cleaning of teeth, each gear s is 45 seconds at a time, starting from the first gear, each gear can be used once to complete a comfortable and fast tooth cleaning process. Of course, if you feel insufficient, each gear can be used twice. The cleaning principle is ultrasonic, and different frequencies have different effects. gear is low frequency, which can make sundries leave the tooth surface, and the second gear is medium frequency, which can clean tartar that can not be cleaned by ordinary toothbrushes. The third gear is high-frequency massage, which can prevent gingival atrophy, promote periodontal circulation, reduce the occurrence of periodontal diseases, and cooperate with two lights to whiten and keep our teeth healthy.sonic electric toothbrush ultrasonic automatic adult toothbrushes usb rechargeable waterproof tooth brush dentalFeature: ior MaterialThe U shape toothbrush head is made of food grade silicone, soft, non-toxic and no harmful, effectively sterilizing and comfortably massaging.4 Working ModesSoft cleaning mode, powerful cleaning mode, massaging mode, and cold light whitening mode. adjust it by simply pressing the power s .U-Shape ly fitting human mouth, in 48000rpm vibration, it cleans teeth without dead angles. and Convenient UsingUSB rechargeable ensures hands-free teeth brushing experience, and IPX7 waterproof for more efficient and convenient using experience.Auto Memory FunctionAutomatic memory function makes 45 seconds teeth brushing time, and 15 minutes cold light teeth whitening time. FunctionUltrasonic wave technology adopted, it can remove more tooth stain, plaque, bacteria in short time, offering healthier and whitener teeth. :Material: ABS + Silicone supply: USB charging capacity: 400mAhCharging time: Approx. 2 hoursContinuous using time: 30 minutesVoltage: 5V : 5W proof: IPX7Vibration frequency: 48000rpmCharging indicator: light flashes while charging, constantly on when fully chargedItem size: 17*10*6cmProducts from Chunchuan's store