A Single Brush Head Can Be Used For 6-12 Months (This Set Is Also Equipped With A Replacement Brush Head). ^ The Number Of Bristles Increased From 768 In The Third Generation To 1908. In Order To Better Brush Teeth And Massage Gums, The External Test Also Adds A Brush Head.^ Four Modes Of One Key Operation: A. Strong Mode, Strong Brushing; B. Medium Mode, Comfortable Brushing; C. The Way Of Gum Massage; D. Whitening Mode Of Tooth Whitening.This U-Shaped Toothbrush, You Just Need To Gently Bite It, And Then Swing Left And Right To Clean The Toothbrush 360 Degrees.^ Gently Bite The Brush Head And Use The Sound Wave Vibration To Clean Your Teeth In An All-Round Way. You Can Make Up While Brushing Your Teeth Or Wear Clothes. ^ This Electric Toothbrush Will Make Your Morning Time More Effective. When You Use The Blue Light Whitening Mode, You Can Completely Free Your Hands.