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.

当你的乳牙后，你的恒牙就接着在后面继续生。

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，同样的牙齿制造过程就在里重复发生，直到你恒牙。

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

我还有乳牙，然后我把牙齿拔了，样恒牙才能。

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

当你的乳牙感觉到后面恒牙在生，它们的根部开溶解，然后它们就脱落了。

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, 第二批牙齿或者说恒牙将会在你随后的生命中一直与你相伴。

Permanent teeth, I guess, or your adult teeth.

我猜是恒牙，或者说你的成人牙。

I hope your grown-up tooth grows in fast.

希望你的恒牙能快点。

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

有七颗恒牙到现在都没。

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

当我们大，乳牙脱落，取代之的是恒牙。

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

你的牙齿很珍贵，你知道，一旦你了恒牙，就不会再有新的了。

I'm saying you have the same amount of adult teeth as you have kid teeth, right?

我说你的恒牙数量和你原的乳牙数量一样，对吧？

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

当你的乳牙的时候, 你的恒牙已经在它们后面了。

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.

但当些恒牙后，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 颗牙齿，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 颗臼齿，包括 4 颗智齿，儿童有 20 颗牙齿。

That can be caused by not enough food, so a time of famine, but it can also be caused by periods of childhood illness as your adult teeth are forming.

可能是由于食物不足，比如饥荒时期，也可能是由于童年时期患病，导致恒牙发育期间受到影响。

You're with News Hour, and while many species can regenerate their teeth, human beings only get one chance at growing a healthy set of adult pearly whites, and that is until now.

您正在收看的是新闻时间节目。 虽然许多物种能够再生牙齿，但人类一生只有一次机会一副健康的成人恒牙，不过一现状即将改变。

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现了钙元素和矿物元素磷的流失。研究人员称种腐蚀程度算是严重的了。