Carbonating that (which is adding carbonic acid) lowers its pH to about 5. (Happily, that is well in the tooth-safe zone, so you can go ahead and drink your plain sparkling water without worry.) The trouble starts when flavors are added, and the citric acid commonly used in bottled flavored waters is considered especially insidious because besides lowering pH it also may remove calcium from the teeth. A 2016 report published in the Journal of the American Dental Association found that un-carbonated flavored waters such as grape, lemon or strawberry Dasani had a pH of 3, only somewhat better than RC Cola and Coca-Cola, which were among the most acidic tested, at 2.32 and 2.37 respectively (and which are close to the pH 2.25 of pure lemon juice). On its website, the brand Hint says the pH of its waters range from 3.5 to 4.
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