The water contains chemicals from the ground – including fluoride.

水中含有来自地下的化学物质，包括氟。

The new standard would limit that to 0.7 milligrams of fluoride per liter.

规定则将氟含量限值降低为升0.7毫克。

In most toothpastes and many water supplies, we use tiny amounts of fluoride.

除了降低糖和淀粉的摄取量，大多数的牙膏和饮用水中。

Fluoride and teeth, compression and engines, X-rays and bone health or telegraph and wiring.

氟化物和牙齿，压缩和发动机，x 光和骨骼健康或电报和布线。

But the researchers found something that works even better than fluoride: iron.

那就是铁。

Adding fluoride to the water makes teeth resistant to the bacteria that can cause tooth decay.

向水中添加氟能使牙齿能抵抗导致蛀牙的细菌。

Dentists can help by giving you a fluoride treatment, but you have to brush and floss regularly.

医生还以为你做氟化物治疗（蛀牙部位涂上高浓度的氟化物，令初期蛀坏的部分还原），但是，你必须定期洗牙，还要经常使用牙线清洁牙齿。

And they are quick to note that regular cleaning with fluoride toothpaste helps prevent cavities in the first place.

而且他们很快提醒大家，经常使用含氟牙膏刷牙有助于从最初就防止蛀牙。

Currently the FDA allows bottled water with added fluoride to contain between 0.8 and 1.7 milligrams per liter.

目前，美国食品药品监督管理局允许加入瓶装水中的氟含量升0.8至1.7毫克之间。

They found that three different strains of cavity-causing bugs cling less tightly to enamel that's been rinsed with fluoride.

他们发现引起蛀牙的三种不同的菌株很少粘附于有氟化物加固的牙釉质表面。

They find that fluoride treatment can loosen bacteria's grip on tooth enamel. The study is in the journal Langmuir.

他们发现氟处理能缓解牙釉质里细菌的压力。这项研究发表《朗缪尔》期刊上。

For instance, to maximize the hydrogen fluoride production by adding or removing some of the substances.

例如，通过添加或去除某些物质来最大限度地提高氟化氢的产量。

And that's where the fluoride hangs out, helping to stave off an acid attack of the enamel—in other words, a cavity.

而氟化物就这里聚，帮忙延缓阻挡牙釉质的酸蚀—换句话说抑制蛀牙。

They usually use a fluoride solution, and they scrape all the dirty stuff off your teeth.

他们通常使用氟化物溶液，将牙齿上的所有脏东西刮掉。

Let's do this for hydrogen fluoride, or HF, an integral part of the process of refining gasoline.

让我们对氟化氢 (HF) 执行此操作， 它是精炼汽油过程的一个组成部分。

Some scientists say the new FDA limits on bottled water with fluoride don't go far enough, that the limit should be lower.

一些科学家说，的食品药品监督管理局对含氟瓶装水的限制还不够，限制应该更低。

But everything else will be true to life, including the molten fluoride salt that will flow through the device to cool it.

但其他的一切设备都是实物质，包括流经设备进行冷却的氯化物熔盐。

As a try, he smeared some fluid fluoride on the leaves, so the flowers would gloss fluorescence in the darkness!

作为一种尝试，他花瓣上涂了些流质的氟化物。花儿会黑暗里发出荧光！

The U. S. Food and Drug Administration is considering a lower limit on the amount of fluoride that's allowed in bottled water.

美国食品和药物管理局正考虑降低瓶装水中氟化物的允许含量。

The American Dental Association, which supports adding fluoride to water, says the FDA's proposal would still work to prevent tooth decay.

支持向水中添加氟化物的美国牙科协会表示，FDA的建议仍然以防止蛀牙。