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。
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I chipped the enamel on my front tooth when I fell over.
我跌倒时门牙的珐琅质碰碎了。
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