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1·The root isn't covered with tooth enamel.

牙根是没有牙釉质盖住的。

2·As we age, the outer layer of tooth enamel wears away.

随着年龄增长，我们牙齿外层的釉质会慢慢地磨损。

3·Tooth enamel analysis revealed they ate fruit, nuts and leaves.

—经牙釉质分析后显示，他们以水果，坚果和树叶为食。

4·An analysis of her tooth enamel suggests she ate fruit, nuts and leaves.

通过对牙釉质分析，她以水果，坚果及树叶为食。

5·The stomach acid from repeated vomiting can severely erode tooth enamel.

反复的胃酸呕吐会严重损坏牙釉质。

6·Outer layer of the tooth enamel and ivory to protect the pulp quality.

牙齿的外层有珐琅质及象牙质来保护牙髓。

7·She used a slither of tooth enamel the size of a nail clipping to trace his origins.

埃文斯通过大小相当于小钉的牙齿瓷釉（珐琅）质，来确定他的来历。

8·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。

9·Saliva also bathes teeth in calcium, phosphate and fluoride, which strengthen tooth enamel.

唾液也能洗刷使牙釉质更加坚固的钙，磷酸盐和氟化物。

10·Your dentist can see if you're grinding, because areas of the tooth enamel will be worn smooth.

“你的牙医可以检查出你有没有磨牙，因为牙齿珐琅质的磨损区会是光滑的。”