food additive e171 in chewing gums. danger titanium dioxide concept. 3d render

additive agent banning chemical coloring colour compound dangerous dental dioxide dye e171 effect europe european flavor food freshness genotoxic gum impurity ingredient inorganic law nano not particles peppermint piece pigment powder preservative preserving prohibited regulation render reprotoxic risk safe safety supplements tio2 titanium tooth union use white whitening