First, the big myth: no, carbonated water does not dehydrate you. It is just as hydrating as still water—period. The carbonation is simply carbon dioxide gas dissolved under pressure.
When you drink it, that gas expands in your stomach, creating a feeling of fullness. That’s why some people say it helps them eat less, though it’s more of a temporary trick than a diet solution.
Your body handles the CO2 just fine, burping out the excess. Technically, you’re drinking water with a party hat on.
Your Teeth: A Delicate Friendship
Here’s where we need a gentle reality check. Carbonated water forms carbonic acid, which gives it that slight tang. This acid is weak, but it can soften enamel over time if you sip it all day long.
However, the risk is wildly exaggerated. Plain sparkling water is about 100 times less acidic than soda. Your saliva neutralizes it fast, especially if you don’t swish it around like mouthwash.
Pro tip: Drink fizzy water with a meal, or rinse your mouth with plain water afterward. And for the love of enamel, skip the lemon or lime—citrus acid is the real villain here.
