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 switch. You can touch the left and right fangs by shaking it left and right with your hands. 360-degree omni-directional cleaning of teeth, each gear switch 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. The first 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 blood circulation, reduce the occurrence of periodontal diseases, and cooperate with two nano blue lights to whiten and keep our teeth healthy.sonic electric toothbrush ultrasonic automatic adult toothbrushes usb rechargeable waterproof tooth brush dental Feature:Superior Material The U shape toothbrush head is made of food grade silicone, soft, non-toxic and no harmful, effectively sterilizing and comfortably massaging. Working Modes:Soft cleaning mode, powerful cleaning mode, massaging mode, and cold light whitening mode. You can adjust it by simply pressing the power switch. U-Shape Design:Designed for perfectly fitting human mouth, in 48000rpm vibration, it cleans teeth without dead angles. Smart and Convenient Using:USB rechargeable ensures hands-free teeth brushing experience, and IPX7 waterproof for more efficient and convenient using experience. Auto Memory Function:Automatic memory function makes 45 seconds teeth brushing time, and 15 minutes cold light teeth whitening time. Strong Function:Ultrasonic wave technology adopted, it can remove more tooth stain, plaque, bacteria in short time, offering healthier and whitener teeth. Specification: Material: ABS and Silicone Power supply: USB charging Battery capacity: 400mAh Charging time: Approx. 2 hours Continuous using time: 30 minutes Voltage: 5V Power: 5W Waterproof: IPX7 Vibration frequency: 48000rpm Charging indicator: blue light flashes while charging, constantly on when fully charged Item size: 17x10x6cm