And this part of your tooth is super sensitive.

髓分非常敏感。

If destruction continues into the dentin layer, then the caries lesion enlarges towards the pulp.

本质层的损害继续蔓延，缺损会延伸到髓。

Eventually, the bacteria penetrate into the pulp, causing irritation and damage to the nerves.

最终细菌侵犯髓，对神经产生刺激或损害。

Usually, they only trigger pain when the tooth's inner pulp and its nerves are already inflamed.

通常情况下，它们只在齿的髓及其神经已经发炎的情况下才引发疼痛。

It contains microscopic, fluid-filled tubules that run from the pulp to the underside of the enamel.

它包含微小的、充满液体的小管，从髓一直到釉质下层。

And that flow stimulates the nerves in the pulp of your tooth, causing shooting pain.

而种流动刺激了你的髓中的神经，导致射痛。

From there, they enter the soft center of the tooth, called the pulp, where they provide nutrition and sensation.

自此进入齿柔软的中心：髓，它可以提供营养，产生感觉。

These kinds of toothaches are often infections in the pulp of the tooth.

的痛通常是髓感染。

We call this pulpitis, although there are different strains of this.

我们称之为髓炎， 尽管它有不同的种。

Kamarava's endodontic training and experience was provided.

提供了 Kamarava 的髓病学培训和经验。

It's provided him with the ability to treat all types of endodontic cases.

使他具备了治疗所有髓病病例的能力。

So in order to protect the delicate pulp inside of your teeth, you have take really good care of the outside.

所以，为了保护齿脆弱的髓，你必须好好保护齿外层。

And it’s made up of three layers: the enamel, the dentin, and the pulp.

它由三层组成：釉质、本质和髓。

When left untreated, dental caries advances toexpose pulp tissue and provides facile access for bacterial invasion.

如果不进行治疗, 龈病变会发展到暴露髓组织, 为细菌入侵提供方便。

His practice is limited to endodontics.

他的业务范围仅限于髓病学。

I didn't even know the word endodontist existed before today's free plug.

在今天的免费插件之前我甚至不知道髓病专家个词的存在。

But the cavity doesn't really start to hurt until it gets through the dentin to the soft pulp. That'swhen you get a toothache.

但是，要等到酸性物质通过本质，开始腐蚀髓了才会对齿造成本质的伤害。个时候齿也就开始疼起来了。

There's an outer layer of hard enamel, an inner layer of pulp, which contains blood vessels and nerves, and a layer of dentinin between.

外层是坚硬的釉质，层是含有血管和神经的髓，中间还有一层本质。

It involves complete extirpationof obliterated pulp tissue and intimate obturation of instrumentedcanals with synthetic inert materials such as gutta-percha.

它涉及完全切除被抹去的髓组织, 并用合成惰性材料(如古塔珍珠)对仪器化的导管进行亲密堵塞。

The same goes for dentine, which is the calcified tissue that lies underneath tooth enamel, protecting the dental pulp encased within.

同样，本质也是如此，它是一种位于釉质下方、保护着其中髓的钙化组织。