[Study on traditional tooth blacking].
D001729:Bismuth / Q000494:pharmacology*; D002327:Cariostatic Agents / Q000494:pharmacology*; D002614:Chelating Agents / Q000037:antagonists & inhibitors*; D003731:Dental Caries / Q000517:prevention & control; D003743:Dental Enamel / Q000187:drug effects*; D006801:Humans; D066298:In Vitro Techniques; D007501:Iron / Q000494:pharmacology*; D013634:Tannins / Q000494:pharmacology*
D002327:Cariostatic Agents; D002614:Chelating Agents; D013634:Tannins; D007501:Iron; D001729:Bismuth