Not that I drink a lot of pop (soda to some of you), but my dentist has always told me that whether it's citric acid, sodium citrate, or phosphoric acid, they are all especially bad for your teeth. I think that list covers the range of acids used in most of the Coke and Pepsi products.
Of course, there are many, many other things that are also bad for your teeth, including juice for children.
But I like to think that almost anything can fixed with good rum, so what do I know.