A single brush head will last 6-12 months (this set also comes with replacement brush heads).The number of bristles has increased from 768 in the third generation to 1908. In order to better brush teeth and massage gums, Waice also added a brush headFour modes of one-button operation: A. Strong mode, strong brushing; B. Moderate mode, comfortable brushing; C. Gum massage mode; D. Teeth whitening mode. This U-shaped toothbrush, just bite it lightly, shake it left and right, and clean the toothbrushin 360 degreesGently bite the brush head and use sonic vibration to clean teeth in all directions. You can wear makeup while brushing your teeth, and you can also put on clothes.This electric toothbrush will make your morning hours more efficient. When you use the blue light whitening mode, you can completely free your hands.Standard configuration: 1 machine + 1 toothbrush head + 1 USB charging cable + 1 Chinese and English manualHow to use: Gently put the toothbrush head into the mouth, and it only takes 30 seconds to complete a 360 all-round tooth cleaningShipment Quantity: 1 piecePackage Contents: Only the above package content, other products are not included.Size: 113*66*28mm(Reminder: The size is measured manually, please allow 1-2cm measurement error)color: White(Due to different monitors and lighting effects, the actual color of the product may be slightly different from the picture color.)Products from BAZHOU's store