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？