科普專欄–薯不揀單 - 深入淺出–牙膏內為何會添加氟化物？

配合牙膏早晚刷牙能有助預防蛀牙，是眾人皆知的事情。481Please respect copyright.ＰＥＮＡＮＡqOB6j0LwGi
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但你又知唔知為何牙膏普遍會含有氟化物(Fluroide)? 其用意究竟何在呢？481Please respect copyright.ＰＥＮＡＮＡ5vQKBBwlk0
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（圖2）牙齒的最外層就係琺瑯質(Enamel)，主要由礦物質hydroxyapatite組成。481Please respect copyright.ＰＥＮＡＮＡl8qJHR1juG
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口腔內的細菌，會從我們進食的食物中攝取糖份，並消化為乳酸，間接導致口水的pH值下降。481Please respect copyright.ＰＥＮＡＮＡAAqRIfQeMs
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當口水pH值低至5.5以下的時候，琺瑯質裡頭的礦物質便會開始被分解，而口腔細菌就會乘虛而入，造成蛀牙。481Please respect copyright.ＰＥＮＡＮＡvA5az1bnAJ
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而牙膏的氟化物能有助抑壓這個酸性分解作用，同時當pH回復正常的時候，氟化物亦能幫忙建構所失去的礦物質。481Please respect copyright.ＰＥＮＡＮＡsfUPkGxJlR
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氟化物還有各種不同的機制預防蛀牙，這裡只列出其中的一項。481Please respect copyright.ＰＥＮＡＮＡCY8QHThi5u
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（圖3）只不過，氟化物牙膏並不是萬能的，原因可從圖中得知。481Please respect copyright.ＰＥＮＡＮＡWta4lbOWVG
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如果想我快啲出文的話，請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark，這對我非常之重要。481Please respect copyright.ＰＥＮＡＮＡ97SCmRapiH
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同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」，以課金的方式推動我繼續搜羅資料寫文，多謝。481Please respect copyright.ＰＥＮＡＮＡOJ0Z9FZrOc
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https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio481Please respect copyright.ＰＥＮＡＮＡljrs1KnR9m
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