<p>describe: </p> <p> The number of bristles has increased from 768 in the third generation to 1908. In order to better brush teeth and massage gums, external testing also added a brush head. </p> <p> Four modes of one-key operation: </p> <p> A. Powerful mode, powerful brushing; </p> <p> B. Moderate mode, comfortable to brush teeth; </p> <p> C. Gum massage method; </p> <p> D. Whitening mode for teeth whitening. With this U-shaped toothbrush, you only need to bite it gently and then swing it left and right to clean the toothbrush 360 degrees. </p> <p> Gently bite the brush head and use sonic vibrations to clean your teeth. Full range of teeth. You can brush your teeth while putting on makeup or getting dressed. </p> <p> This electric toothbrush will make your mornings more efficient. When you use blue light whitening mode, you can completely free your hands. </p> <p> Package contents: 1 piece toothbrush</p>