You wished for your child to have all permanent teeth.

你多希望孩子的牙都换成了恒牙。

By the time your baby teeth came in, your permanent teeth were already growing in behind them.

当你的乳牙长出，你的恒牙就接着在面继续生长。

I still had baby teeth, and I had my teeth pulled so that the adult teeth could come in.

我还有乳牙，然我把牙拔了，这样恒牙才能长出来。

And it's here, thanks to stem cells, that the same tooth-growing process repeats to form your permanent teeth.

因为干细胞，同样的牙过程就在这里重复发生，直到你长出恒牙。

As your baby teeth feel those adult teeth growing in behind them, their root dissolves and they fall out.

当你的乳牙感觉到面恒牙在生长，它们的根部开始溶解，然它们就脱落了。

I've got seven permanent teeth that still haven't come in.

有颗恒牙到现在都没长出来。

As we mature, our baby teeth drop out, replaced by adult teeth.

当我们长大，乳牙脱落，取而代之的是恒牙。

Your teeth are kind of precious in terms of, you know, once you have your permanent teeth you don't get new ones.

你的牙很珍贵，你知道，一旦你长出了恒牙，就不会再有新的了。

Permanent means " lasting, " and these second or permanent teeth ought to last you all the rest of your life.

“恒”就是“持久”的意思, 而这第二批牙或者说恒牙将会在你随的生命中一直与你相伴。

His permanent teeth were coming in, but they were blue and far apart like his baby teeth had .

他的恒牙长出来了， 但它们是蓝色的， 而且距离很远， 就像他的乳牙一样。

But after those adult teeth grow in, all the stem cells that laid down the crystal nanorods self-destruct, so that's the only set of replacement teeth you get.

但当这些恒牙长出，所有生成纳米结晶体的干细胞就会自我消亡，所以你只能有这一副替换牙。

Most adults have 32 teeth called permanent or secondary teeth; 8 incisors, 4 canines, also called cuspids, 8 premolars, also called bicuspids, 12 molars, including 4 wisdom teeth whereas children have 20 teeth.

大多数成年人有 32 颗牙，称为恒牙或副牙；8 颗门牙，4 颗尖牙也叫犬牙，8 颗前磨牙，也称为双尖牙，12 颗臼，包括 4 颗智，而儿童有 20 颗牙。

In the lab, adult teeth soaked in white wine for a day suffered a loss of both calcium and a mineral called phosphorus to depths of up to 60 micrometers in the enamel surface, which the researchers say is significant.

实验室中，浸泡在白葡萄酒中的恒牙（成年牙）60微米的表层牙釉质中出现了钙元素和矿物元素磷的流失。研究人员称这种腐蚀程度算是严重的了。

Some of his permanent teeth had already come — but they were small and blue like he had been eating blackberries. He drew a line for taw and lay on his stomach to take aim for the first hole.

他的一些恒牙已经长出来了——但它们又小又蓝，就像他一直在吃黑莓一样。他画了一条线，趴在地上准备瞄准第一个洞。