A tooth left overnight in a glass of Coca-Cola will be fully dissolved by morning.
The acidic nature of Coca-Cola is probably what makes this rumor seem believable. However, it is just that, a rumor. Acidic content can be found in many beverages, including natural ones like buttermilk and fruit juice. However, little children are not routinely warned of the dire permanent consequences that will befall their smiles if they drink too much Tropicana.
SOURCE: Products And Packaging Myths & Rumors | thecoca-colacompany.com