Zinc. Nakuba izifundo ezimbalwa⁴ baye babonisa ukuthi i-zinc, ngendlela yokugeza umlomo noma i-toothpaste, inganciphisa ukwakheka kwe-plaque nokwakheka kwe-tartar, ngaphezu kwalokho, ucwaningo oluhlelekile luyadingeka ukuze kuqinisekiswe ukusebenza kahle kwayo okunamandla empilweni yamazinyo.