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氟中毒会导致牙齿变色或表面缺陷。
Fluorosis can cause tooth discoloration or surface irregularities.
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第三个问题：为什么人们的牙齿变色后衰老？
Third Question: Why do people's teeth discolor upon aging?
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第三个问题：为什么人们的牙齿变色后衰老？
Third Question: Why do people's teeth discolor upon aging?
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