You’re probably asking yourself how bad? It’s worse than most people can possibly imagine. These delicious, fizzy and sugary drinks, even the diet versions, are almost as corrosive as battery acid. That’s something you would never drink. Surprised? Citric acid is placed into most fizzy drinks because it acts as a preservative. Because of this, sodas can become a serious problem even for the casual drinker’s teeth. It chips away at your teeth and gums. Your mother probably told you to use a straw several times. Use it!