incisor|incisors

我的门牙有点敏感，吃冷的东西会疼。

My ___incisor is sensitive and hurts when I eat cold food.

兔子用它锋利的门牙啃胡萝卜。

The rabbit nibbles on a carrot with its sharp ___incisors.

我的门牙很锋利，可以轻松咬断苹果。

My ___incisors are sharp and can easily bite through an apple.