Here’s the short, science-backed truth: yes, seltzer counts as water. Your body doesn’t care if H2O arrives solo or dressed up in carbon dioxide. The kidneys, those overworked bouncers of your bloodstream, treat carbonated water the same as still water—they just process the bubbles and move on.
But wait—doesn’t the fizz make it less hydrating? Nope. A 2026 study in the American Journal of Clinical Nutrition found that seltzer is just as hydrating as regular water over a 24-hour period. The only difference? You might burp a little more, which is technically a win if you’re trying to impress nobody.
The Acid Myth You’ve Been Fed
I can already hear the skeptics: “But seltzer has carbonic acid! It’ll dissolve your teeth like a gummy bear in a hot tub!” Calm down, internet. The pH of seltzer is around 4.5—about the same as black coffee or orange juice. Your saliva is a master negotiator and neutralizes that acid within minutes.
Unless you’re swishing seltzer in your mouth for three hours straight like a wine critic, your enamel is fine. If you want a real dental horror story, talk to the guy who drinks battery acid—oh wait, you can’t, because he’s a fictional example I just made up.
