骨质象牙化：骨头退化成坚硬的象牙质。
Eburnation: degeneration of bone into a hard ivorylike mass.
它们都有研磨作用，会磨损牙釉质，长此以往会导致牙齿敏感和发黑，因为牙釉质磨损会暴露出里面黄褐色的牙质。
They are abrasive and can wear your enamel away and in the long-term lead to sensitivity and darkening of your teeth as the enamel wears and the inner amber-coloured dentine becomes visible.
他用的是一道激光而不是烦人的涡轮钻来清除象牙质和牙齿的珐琅质。
Instead of a whiny turbine drill he USES a flash of laser light to blast away dentin and enamel.
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