A single brush head can be used for 6-12 months (this set is also equipped with a replaceable brush head). ^The number of bristles has been increased from 768 in the third generation to 1908. In order to improve tooth brushing and massage the gums, the external test has also added a brush head.^Four modes with one-button switching: A. Strong mode, powerful brushing; B. Medium mode, comfortable brushing; C. Gum massage mode; D. Whitening mode for teeth whitening. This U-shaped toothbrush only requires you to gently bite it and then swing left and right to clean your teeth 360 degrees.^Gently bite the brush head and use the sonic vibrations to clean your teeth in an all-round way. You can put on makeup while brushing your teeth or get dressed. ^This electric toothbrush makes your morning routine more efficient. When using the blue light whitening mode, you can completely free your hands._PA