A common misconception is that seltzers and sugar-free sodas are not harmful to your teeth. However, even without sugar, the acidity of seltzers and soda can still be very damaging to your tooth enamel.

The average pH level of water sits at 7, which is neutral on the scale of acids and bases. Anything that measures 5.5 or less on the pH scale is considered acidic. Maybe surprising to you, seltzers come in around 3 to 4, and diet sodas around a level of 2 or 3, which are all incredibly acidic to your teeth. For reference, the pH level of battery acid sits at a 1.

Acidic drinks can wear enamel down, weakening it and causing long-term tooth erosion. Acidic foods and drinks soften tooth enamel, which makes teeth sensitive and vulnerable to damage, such as cavities. Drinks that are high in both acid and sugar have the potential to be doubly damaging.

For drinks that are particularly acidic, consider using a straw. This will lessen contact time with your teeth.