Fluoride helps protect your teeth from the acid that is released when this happens. It does this in two ways.

氟能够通过两个途径在细菌新陈代谢是你口腔成为酸性的时候保护你的牙齿。

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First, fluoride makes your tooth enamel stronger and less likely to suffer acid damage.

首先，氟能够使你牙齿的釉质更坚固，同时降低酸性的腐蚀程度。

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To get to the bottom of this, a chemist recently took bone from the mummy of a Nubian child and dissolved it in hydrogen fluoride, a nasty acid that helps extract tetracycline.

最近，一名化学家提取了一个努比亚幼儿木乃伊的骨头，在深入底层的过程中，将它融化泡入了一种肮脏的氢氧化物——酸中，有助于提取其中的四环素。

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The oxide (which comes from an ore called coltan) is converted to a fluoride using hydrofluoric acid, and the fluoride is then reduced with liquid sodium.

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