Fluor protector was used to treat the root surface and covered once in half a year.Then we observed the change of the caries prevalence rate and DMFT two years later.是什么意思_Fluor protector was used to treat the root surface and covered once in half a year.Then we observed the change of the caries prevalence rate and DMFT two years later.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句