Unique U-shape Our Electric toothbrush kit is designed as a unique U-shape, which echoes the shape of the teeth bite, and can be applied deeper than ordinary toothbrushes. Matching high-frequency sonic vibration, it can clean the surface and the inside of the teeth quickly and deeply in all directions, thereby protecting the health of the teeth. High-Quality MaterialOf food-grade environmentally friendly silicone, this sonic whitening toothbrush has super water resistance, which can be washed and reused.Wireless Charging This sonic toothbrush adopts wireless charging dock that just only need 3-hours charging can last 1-week using. It also has low battery reminding, which is very safe, convenient and portable to use at home or during traveling. Our automatic toothbrush is your professional daily dentist which helps promote the health of the gums and teeth with different function as follows : 1. Strong for powerful teeth brushing; 2. Medium for comfortable teeth brushing; 3. Massage for gum massage; 4. Whitening for teeth whitening.