【拼 音】 fàláng ,又叫牙釉质（enamel），是在牙冠表层的半透明的白色硬组织，十分坚硬，洛氏硬度（Knoop hardness number）仅次于金刚石。
当微风吹起，它们就就咯喇喇响，当它们的珐琅质被搅动开裂时，它们会变成五颜六色。
They click upon themselves as the breeze rises and turns many-colored as the stir cracks and crazes their enamel.
牙齿表面的细菌会把糖转变成乳酸，腐蚀珐琅质并导致蛀牙。
Bacteria living on teeth convert sugar into lactic acid, which erodes enamel and causes tooth decay.
不过桔子汁高蔗糖含量会损坏牙齿的珐琅质，也能增加患2型糖尿病的风险。
But the high sucrose content of orange juice attacks the enamel on your teeth and can increase the risk of Type 2 diabetes.
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