JUST A THOUGHT: If, as they say, whoever they are, which is another subject entirely, as I'm sure you will agree, you should avoid drinking Coca-Cola because the acid level in the beverage is so high you could clean the stains off your toilet using the stuff, would it not then make more sense to drink an ever-increasing amount of Coke, and thereby avoid the stains in the first place? An ounce of prevention, or twenty ounces nowadays, if you buy them in the larger bottles, is worth a pound of cure, as a different they than the they who said you shouldn't drink Coke at all once said.