牙结石—如果菌斑呆的时间足够长，它就开始矿化变硬形成牙石或牙垢，因为菌斑从唾液中吸收了钙，磷和其他矿物质。
Calculus - If left alone long enough, plaque begins to mineralize and harden into calculus or tartar because the plaque absorbs calcium, phosphorus and other minerals from saliva.
口香糖能够增加唾液分泌，有助消灭齿菌斑。
The gum can stimulate saliva flow, which helps fight plaque .
目的：测定正常人使用含氟漱口液和APF溶液后，唾液及菌斑中氟离子浓度，并探讨其对龋病预防的意义。
Objective: To measure the fluoride concentrations in dental plaque and saliva after the use of sodium fluoride rinses and APF solutions and evaluate the significance in caries prevention.
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