Missy, diet sodas are terrible for you. I have one occasionaly, but the acid in the soda is what is bad. Look at it this way, if it will eat the battery acid and gunk off of a battery, eat the paint off a car, dissolve the shell of an egg, what is it doing to your teeth? I work for a dentist and we see a lot of soft drink decay, so yeah, avoid them too lol!