1、tooth是名词，意思是牙，牙齿，其复数形式是teeth。
2、例如 Brush your teeth thoroughly morning and night.早晚要好好刷牙。I had to have my tooth out.我不得不拔了颗牙。
3、常见的短语有：a broken tooth破损的牙齿。a missing tooth掉了的牙齿。a front tooth前牙。a back tooth后牙。a false tooth假牙。a baby tooth 乳牙。例如The tooth he pulled out was his front tooth.他拔的牙是他的门牙。