Lemons are so acidic they can actually take the protective enamel off your teeth.

实际上柠檬酸到可以把你牙上具有保护性质的珐琅质去。

First, the acid eats away the very hard outer layer of yourtooth, called the enamel. Inside the enamel is the dentin.

酸性物质会先腐蚀牙冠表层的珐琅质。珐琅质所包覆的便是牙本质。

That strengthens teeth and encourages the growth of enamel crystals that build up a tooth's defenses against acid.

也添加了微量的氟化物可以强化牙、促进珐琅质的生长。

Fire had polished the sparkling enamel of its inner walls, sprinkled all over with mica-rich dust.

火力把珐琅质的和发光泽为洞壁摩亮了，洞壁上满是云母石的粉屑。

They're false in that they're not made of what our teeth are made of: dentin and enamel.

“伪牙”不是由我们牙的材料——牙本质和珐琅质——构成的。

Dentists sometimes will fill a cavity by putting in a filling while the decay is still in the enamel.

当珐琅质遭到腐蚀，医生有的候会采取补牙的方式进行治疗。

It's spongy and has nerve endings, soyour tooth might be sensitive to sweets or cold if the decay reaches there.

牙本质不如珐琅质坚硬，其中还含有很多的神经末梢。因而，如果牙本质也受到了腐蚀，牙食或是过冷的东西就会很敏感。

If it's properly treated, the decay will stop, and the enamel will harden, although the tooth will never be perfect again.

如果治疗得当，腐蚀将会停止，珐琅质也会重新变硬，中不足的是，牙不会像受腐蚀前那么完了。

Generally, as carnivores consume protein-rich meat, certain nitrogen isotopes accumulate in their tissues— including the enamel of their teeth.

一般来说， 当食肉动物食用富含蛋白质的肉，某些氮同位素会积聚在它们的组织中——包括牙的珐琅质。

The acid content in the Coke would destroy the enamel on your teeth and the sugar would soon lead to cavities.

可乐中的酸成分会破坏牙上的珐琅质，而糖分会很快导致蛀牙。

Teeth, for example, tend to survive decomposition very well, since their outer enamel coating is very hard and contains very little protein, if any.

以牙为例，由于牙外层的珐琅质非常坚硬，蛋白质含量也非常低，因此牙易于分解。

Some people are more susceptible to cavities due to genes that may cause certain weaknesses, like softer enamel, but for most, high sugar consumption is to blame.

你可能会难以置信 目前有 92％ 的国成年人有蛀牙有些人容易蛀牙，是因为基因所导致的珐琅质脆弱。

All these crumbling masses were covered with an enamel polished by the action of underground fires, and they glistened under the stream of electric light from our beacon.

所有这些大堆石头分解了，受地下火的力量上面浮起一层光滑的珐琅质，一经探照灯的照射，发出辉煌的光彩。

Placoderm means " plate skin, " and plated they indeed were, with big chunks of bone, dentine and enameloid armor on their head and bodies.

Placoderm 的意思是“镀层皮肤” ，他们确实是镀层的，头部和身体上有大块的骨头、牙本质和珐琅质盔甲。

As the drink enters your mouth, it's high acid content begins to erode the enamel on your teeth. And the microorganisms in your plaque start to feed off the sugar which can lead to cavities.

当饮料进到你嘴里，高度酸性物质开始腐蚀你牙的珐琅质，菌斑中的微生物会开始以这些醣类维生，导致蛀牙。

If you're picturing skin covered in human teeth - just stop, that's terrifying These " skin-teeth" were really more like bumps made of dentine, which is the hard tissue found underneath the enamel of your teeth.

如果你想象的是人类牙覆盖的皮肤——停下来，那太可怕了。 这些“皮肤牙” 实际上更像是由牙本质构成的肿块，牙本质是牙珐琅质下面的硬组织。