单词teeth的原形是哪个单词

单词teeth的原形是tooth

例句

1.

The residents are fighting tooth and nail to stop the new development.

居民为制止新的建房开发计划正在全力以赴进行斗争。

2.

When did she cut her first tooth?

她什么时候长出的靠前颗牙？

3.

He's got a front tooth missing.

他有一颗门牙掉了。