evidence: So, long story short, are carbonated waters good for your teeth? No. But they’re not as bad as most of the other things we drink. The pH of most bubbly waters might be below the critical pH for most mouths, but as a chemistry student I’d say the claims that these waters are ‘extremely acidic’ are completely false. The pH of Gatorade is about 3, of orange juice is about 3-4 and of Coke is 2.4 (Read about the pH’s of other common drinks here). If the pH to stay above is ~6, then drinking your daily Perrier warm, or even better warm and flat would be best. But if like me, you think that defeats the purpose, then do what I do and rinse your mouth after with tap water.