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 based on external testing. Four one-touch modes: 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 This U-shaped electric toothbrush is designed for easy use. Simply bite gently on the brush head and move it side to side to help clean teeth from all angles. The sonic vibrations work to help remove plaque while providing a comfortable brushing experience. Designed for convenience, this toothbrush allows for efficient morning routines. It can be used hands-free when activated in white mode, allowing multitasking during brushing. Package includes: 1 electric toothbrush