B: Yes, a tooth brush please.

对，还要一支牙刷。

I know tooth brush and tooth paste.

我知道牙刷和牙膏。

Do you need tooth brush?

你想刷牙吗？

Don't forget to pack your tooth brush!

别忘了把牙刷放到箱子里去！

Are you offering them a new improved tooth brush?

你是向他们推销一种改进型新牙刷吗？