带牙线的牙刷：用普通牙刷刷牙，只是清洁了牙齿表面，牙缝的污垢却很难得到清理。用牙线清洁牙齿，可以更彻底地清理牙缝的污垢。但每次刷牙过后都要费力去找牙线，就显得没那么方便了。设计师把牙线盒子安装在牙刷的底部，牙线用完之后，可以打开盒子，换上新牙线，这样我们就可以更加方便地使用牙线。

Toothbrush with floss: Brush your teeth with an ordinary toothbrush, only to clean the surface of the teeth, but it is difficult to clean the dirt between the teeth. Using floss to clean teeth can cleanse the dirt in the gap more thoroughly. But every time after brushing your teeth, you have to struggle to find floss, which is not so convenient. Designers install floss boxes at the bottom of toothbrushes. When floss is used up, they can open the boxes and replace them with new floss, so that we can use floss more conveniently.