I clicked the snopes link. Soda won't dissolve teeth in a day, but sweet soda is addictive. One a day becomes five or ten a day, of acid and high fructose corn syrup working together to attack the teeth for years. Rotting teeth may let bacteria into the bloodstream and damage the heart. A toothless gummable diet of soup and mush does not sound appetizing. Mountain Dew contains bromine, a toxin with a set of serious health effects.