Electric tooth brushes 40 thousand vibrations per minute - Electric toothbrush equipped with a leading motorized motor in the world to generate 40,000 VPM: dissolve deep dirt of the teeth effectively. The cleaning effect 10x that the manual toothbrush: 7 days to bleach the teeth and 14 days for healthier teeth. 8 brush heads last 24 months. - Sonic toothbrush comes with 8 replacement heads: each brush head lasts up to 3 months, so it will be more than 24 months total: the brush is designed in a u shape and the heads can adapt perfectly to the gums and gums and The topography of the teeth are easy to reach deeply between the teeth. Any place: IPX7 Design Waterproof to easily rinse water after each use.