哺乳动物的第二套牙齿之一,它是在乳牙脱落时生长起来的。人类有三十二颗恒牙。
Kits have what are called "milk teeth" until about 7 to 9 weeks old when their permanent canine teeth begin to come in.小狗刚开始的时候是乳牙,一直到7至9个星期他们的犬牙才会开始生长。
Those milk teeth can be really sharp, I am watching my fingers every time when I try to clean his month, sometime he bites me very hard.小奶牙真不假,俺最怕帮他清洁口腔,一不小心我也会被他烙上记号,洒泪史一筐。