Read a study a couple years ago which indicated Red Bull was somewhere around 11 times worse on your teeth than a coke.
I used to drink a lot of diet pepsi's and my dentist suggested I have a couple gulps of water after the soda in order to rinse my mouth as he was starting to see the impact of soda's on my teeth.
Also used to be a big fan of coors light until my first night in Germany. In the states my favorite is Franziskaner.
No matter what, brush yer teeth