He has refused to let me use his toothbrush.

　　他拒絕讓我使用他的牙刷。

　　Use a toothbrush on your tongue as well, and rinse your mouth frequently.

　　舌頭也要用牙刷清潔，并且經常漱口。

　　As soon as the bristles on your toothbrush begin to wear, throw it out.

　　牙刷毛一開始磨損，就把它扔掉。

　　The use of a toothbrush to keep tartar down is very helpful.

　　使用牙刷去除牙垢很有幫助。

　　Have you brought your toothbrush with you?

　　你帶牙刷來了嗎？