牙齿和骨骼的主要成分是羟磷灰石 ,氟离子与羟磷灰石有较大的亲和力 ,而且能把羟磷灰石中的羟基取代出来。含氟的磷灰石更坚实 ,而且难溶于酸。通常 ,口腔中的细菌能使残留在口腔中的糖发酵变成酸 ,这种酸能把羟磷灰石慢慢溶解 ,从而使珐琅质脱落 ,这就是常说的虫牙 ,医学上称? The main component of teeth and bones is hydroxyapatite. Fluoride ion has a greater affinity with hydroxyapatite, and can replace the hydroxy group in hydroxyapatite. Fluorinated apatites are more solid and less soluble in acids. Usually, the bacteria in the mouth can make the sugar remaining in the oral cavity become fermented, which can slowly dissolve the hydroxyapatite and make the enamel fall off. This is what is often said in medicine?