*shrugs*
I drank pop all the time as a kid, all the way through high school. And I have always been of a completely average or even low weight, and have cavity-free teeth. Maybe I just got lucky with the genes, but my mom almost always put a balanced meal on the table at dinner... so it's not as though I was drinking soda all the time while also eating fast food all the time. My mom is Type I diabetic so in general my diet was quite low-sugar/low-fat.

DBF and I keep a small variety of canned pop in our house, but it's as a treat (or "medicine" when I know I might need a little caffeine buzz to stay awake during a long day so I'll pack a can with my lunch ). Probably 90% of all the liquid we consume is water straight from the tap. I didn't get into that habit until college, when I realized that in the dining hall I could pay for soda or drink water for free. I'm sure my body is much better off for that change, but I don't think there's anything wrong with having soda once in a while.