Recommendation? The dentist recommends changing the brush head every 3 months to better protect oral health. Application? This can be applied to people who need whitening teeth such as yellow teeth and tobacco teeth. Power? A powerful motor with a frequency of up to 20,000 times/min, which is more than 10 times stronger than manual toothbrushes. Portability? The small and exquisite toothbrush can be put in the bag, which greatly facilitates business trips and travel. Battery replacement steps? First, we use a key or a coin to insert it into the bottom groove, and then turn it counterclockwise until the positive pole is inward and the negative pole is outward. On the contrary, lock it clockwise. Waterproof performance? The whole toothbrush can be cleaned by contact with water, which is IPX7 waterproof. Let us say goodbye to stains. Brush head? The replaceable toothbrush head can be easily replaced through a simple plug and pull design. Material? Pure aluminum alloy is used to make this metal handle. Advantages? In order not to damage the gums, the tip part of DuPont soft bristles is rounded, which is suitable for children, the elderly and adults. Power supply? According to the calculation of brushing your teeth twice a day and brushing your teeth for 2 minutes each time, the replaceable AAA battery (provided with the body) can be used for 180 days.