Unit 78：Brush and floss第78单元：用餐后要刷牙和剔牙Finish every meal by brushing and flossing your teeth.每次用餐完毕后，要刷牙以及用牙线剔牙。Your mouth will feel so fresh and clean that you won't want to put more food in it.这样你的口腔会感到清爽干净，也就不会想吃东西了。