The issue is with the food itself, not the product. No, I don't recommend eating an entire lemon everyday, but making a lemonade without sugar should be fine. If you're worried, just brush your teeth afterwards.

The key is I'm not marketing this as a party trick. You already eat yogurt, coffee, fruit, chocolate without having to worry about the acid so there are no sudden differences here for your teeth. If anything, think about what removing sugar from your diet could do to your dental health.