The Academy of General Dentistry (via Science Blog) says drinking soda can hurt damage your teeth. Hopefully everyone knew that already. However their experiments did have some interesting results, "Results from the study, which exposed healthy dental enamel to a variety of popular beverages over a period of 14 days, found that non-colas and canned iced tea were especially harmful. They contain flavor additives, such as malic, tartaric and other organic acids, which are more aggressive at eroding teeth. Root beer, which contains the least amount of flavor additives, was found to be the "safest soft drink to safeguard dental enamel." I drink a lot of ice tea (plain, no sugar or anything added). It appears they are only talking about canned tea where they put a lot of crap in it so it will taste better. I think It's safer than drinking soda at least.

Soda contains a lot of sugar that does all kinds of bad things to your body, not just the teeth. Keep in mind that Soda was originally a treat. You went to the soda shop and had it occasionally. Now big corporations have made it like a staple so they can make tons of profit. So go have some water, you can get it bottled and still make sure they make lots of money.