He has refused to let me use his toothbrush.
他拒绝让我使用他的牙刷。
Use a toothbrush on your tongue as well, and rinse your mouth frequently.
舌头也要用牙刷清洁，并且经常漱口。
As soon as the bristles on your toothbrush begin to wear, throw it out.
牙刷毛一开始磨损，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帮助。
Have you brought your toothbrush with you?
你带牙刷来了吗？