The number of bristles has increased from 768 in the third generation to 1908. To better clean teeth and massage gums, an improved brush head design has been added. Four modes with one-key operation: A. Clean mode for thorough brushing; B. Soft mode for comfortable brushing; C. Gum care mode for gentle gum massage; D. White mode for surface stain removal. With this U-shaped toothbrush, simply bite gently and move it side to side to achieve a 360-degree clean. Gently bite the brush head and let sonic vibrations clean your teeth thoroughly. Reach all teeth surfaces easily. Brush while applying makeup or getting ready. This electric toothbrush helps make your morning routine more efficient. The hands-free design allows for convenient use. Package includes: 1 electric toothbrush