tooth復數形式是teeth。
tooth常用作名詞，意思是“牙齒；齒；牙；齒狀部分”，tooth的基本意思是“牙，齒”，其復數形式是teeth，但由tooth構成的復合詞在變成復數時，則只需將主體名詞變成復數形式。
詞匯搭配：
drill a tooth.鉆牙
fill a tooth.補牙
get one's teeth.長牙
have a tooth out.拔牙
front tooth.前牙，門齒
milk tooth.乳齒
saw tooth.鋸齒
wisdom tooth.智齒
短語搭配：
tooth profile.齒形；齒廓
tooth surface.齒面；輪齒表面
long in the tooth.歲口大的（馬）；年邁的，年老的
tooth decay.蛀牙；齲齒；齵齒
tooth root.[醫]齒根；[醫]牙根
雙語例句：
1、Her tooth was extracted under local anaesthetic.
她的牙齒是局部麻醉拔出的。
2、He chipped off a piece of his tooth.
他錛缺了壹點牙齒。
3、I need to have two teeth filled.
我有兩顆牙要補。
4、The residents are fighting tooth and nail to stop the new development.
居民為制止新的建房開發計劃正在全力以赴進行鬥爭。
5、Choose an essay topic that you can really get your teeth into.
選擇壹個妳可以真正悉心鉆研的論文題目。
6、When did she cut her first tooth?
她什麽時候長出的第壹顆牙？
7、A high proportion of five-year-olds have teeth in poor condition.
五歲兒童牙齒不健康的比例高。
8、The dentist may decide that the wisdom teeth need to be extracted.
牙醫可能會認為智齒需要拔掉。
9、They took a plaster cast of the teeth for identification purposes.
他們做了這副牙的石膏模型作鑒別之用。
10、He's got a front tooth missing.
他有壹顆門牙掉了。