Tooth mousse, it's meant to protect the enamel on your teenth.

护素，用来保护的。

Enamel is the hard mineralized outer layer of the tooth.

是齿硬的矿化外层。

The tooth has an enamel covering so it's relatively shiny.

齿表层有 所以稍微亮些。

If you said enamel, flash a big old smile.

如果你选择，那就答对了。

This acid can cause holes, called cavities, to form in the enamel of your teeth.

这些酸会造成蛀洞，形成在表面。

So building enamel is like making rocks in your mouth.

所以生就像在你嘴里生岩石。

If you zoom way in, tooth enamel looks almost like the weave of a basket.

如果放大，它与篮子的纹理非常相近。

Tooth enamel is the hardest substance in your body, did you know?

你知道吗，是人体硬的物?

And your teeth aren't hard enamel all the way through.

并且齿并不是全都是。

The organoids happily churned out the chemical components of enamel.

类器官愉快地分泌出了的化学成分。

Even with protective enamel ridges, these teeth would gradually have worn down.

即使是有保护的脊，这些齿也会逐渐被磨损。

Many foods weaken our enamel and brushing right after can actually damage your teeth.

许多食物损伤，吃完饭后就刷，实际上也损伤齿。

Millions of these rods packed together make up the enamel layer of your teeth.

这些成千上万的结晶物排列堆积，形成了你的。

Enamel is the strongest stuff in your whole body -- even stronger than bone!

是全身硬的东西，甚至比骨头还硬。

Dentin is pretty hard, but unlike enamel, it's porous.

本非常硬，但与不同，它是多孔的。

But synthetic formulations can be less durable than human enamel.

但合成配方可能不如人类耐用。

For enamel, this process produces long, thin strands, each about 60 nanometers in diameter.

在生成的过程中会生细长的纤维状物，每条纤维的直径宽约60纳米。

The process of building enamel is some awesome cellular nanotechnology, up in your face.

形成的过程是一种奇妙的细胞纳米技术，而这就发生在你的脸上。

When all this enamel nano-fabrication is complete, your baby teeth finally bust out.

当所有这些纳米制造过程完成，你的乳就终形成了。

Well now materials scientists have been able to figure out why—by mapping the nanostructure of tooth enamel.

现在材料科学家们通过绘制的纳米结构已经知晓其中的原因。