1.怎样准确刷牙 竖扭转法：牙刷毛与牙面呈45夹角，放到牙面与牙床交汇处，扭转软毛牙刷向咬合方位刷。刷牙齿咬合面时牙刷毛应竖直牙齿咬合面，前后阁下动员软毛牙刷。刷门牙的里侧(