Yep, I started getting cavities on the sides of my teeth.
Didn't read through all the replies, but I do believe there have been studies.
My dentist says that gatorade is the devil.
Lot's of sugar which makes for a very acidic mix. Drink it and then breath heavy through your mouth- as when running, cycling etc and it dries on your teeth- and eats into them..

edit to add.... Brush your teeth after workouts where you have injested sports drinks!