Lub raj mis ntim qhov zoo:
1, vim hais tias lub khob ntim khoom tsim nyog rau kev tsim cov khoom siv tsis siv neeg filling ntau lawm, kev txhim kho lub raj mis tsis siv neeg filling tshuab thiab cov khoom siv kuj yog cov paub tab, kev siv lub khob ntim cov txiv hmab txiv ntoo thiab zaub kua txiv hmab txiv ntoo, dej cawv dawb wine noj qab haus huv. , thiab lwm yam, muaj qee yam khoom zoo.
2, iav ntim cov ntaub ntawv tuaj yeem yooj yim hloov xim thiab pob tshab, tshwj xeeb tshaj yog pom cov xim ntim cawv;
3, lub khob ntim khoom muaj kev nyab xeeb thiab huv si, muaj kev tiv thaiv corrosion thiab acid corrosion, haum rau acidic tshuaj (xws li zaub kua txiv haus, thiab lwm yam) ntim;
