Teeth have a hard surface layer called enamel.

牙齿有一层叫做釉质的坚硬表层。

《牛津词典》

Enamel is almost completely transparent in the near-infrared spectrum, allowing OCT to create highly detailed images of teeth as well as soft tissue.

由于珐琅质在近红外光谱端近乎完全透明，因此oct可以形成牙齿和软组织的高精确图像。

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The tooth also had all the components of normal teeth, including enamel, crown and root, and connective fibers to fix it to bone.

培育的牙齿还具备正常牙齿的所有组成成分，包括釉质、齿冠和牙根，以及使其固定于骨头的结缔组织纤维。

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The fluoride mixes with enamel, the hard surface on teeth, to help prevent holes, or cavities,from forming.

VOA: special.2009.03.11

Most recently, the company has announced the "world's first application of self assembly used to create a vacuum around nanowires for next-generation microprocessors, " which just so happens to mimic the natural pattern-creating process that forms seashells, snowflakes, and enamel on teeth.

ENGADGET: IBM apes Mother Nature for faster, more efficient chips

Erosion, caused by acidic substances, is a wearing away of the enamel coating of teeth.

BBC: NEWS | Health | Bad teeth blamed on fizzy drinks

This acid attacks the enamel on the teeth and leaves them vulnerable to decay.

BBC: Dental threat of snacking