A few years ago I worked in a restaurant, and I was drinking several glasses of soda a day. I never had problems with my teeth before that, but I ended up getting four cavities in one year. So, I completely stopped drinking any carbonated beverages...haven't had a single one in 9 years, and haven't had any more problems. If you're considering stopping, it gets a lot easier as time goes on...eventually you get to the point where you really don't find soda appealing. Also, sweet tea is a good alternative because even though it has sugar, it isn't nearly as corrosive as soda.
Off Topic: Why do people drink cows milk for nutrishment instead of drinking milk from other humans?
Because that would require raising humans for the purpose of milk production, and force-feeding them hormones so they'll produce milk year-round.