每天刷牙的正确方法

all right add your toothbrush start at the top in a cross side， okay onto the bottom on the near side now be a cross eye all right。 let's get that inner surface start at the top and a cross side now on the near side okay onto the bottom on the near side now be across sweep let's clean those biting surfaces start at the top and across side on the near side on the near side scrap scrap all right。