牙齿的单数和复数用英文怎么说

牙齿的单数英文是tooth，复数是teeth。其来源是古英语tōth。

例句：

She has a missing tooth. (她有一颗缺失的牙齿。)
He brushes his teeth twice a day. (他每天刷牙两次。)
The dentist will replace her broken teeth with implants. (牙医将用假牙替换她损坏的牙齿。)