配合牙膏早晚刷牙能有助預防蛀牙,是眾人皆知的事情。396Please respect copyright.PENANA9AYDc8ouH0
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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?396Please respect copyright.PENANAIG5is6axg3
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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。396Please respect copyright.PENANAKCGrQsXXjQ
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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。396Please respect copyright.PENANAw6Utq7qoOq
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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。396Please respect copyright.PENANA4GMMJUGuV4
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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。396Please respect copyright.PENANAUMSoowmJiQ
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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。396Please respect copyright.PENANAqnfiPlqkSL
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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。396Please respect copyright.PENANA7LICU5p5ff
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