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The Sad Truth About Seltzer: The delightful little bubbles in La Croix and Perrier are kind of bad for your teeth.

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Even when it’s unflavored, fizzy water contains an acid—carbonic acid—that gives it its bubbles. That acidity can gradually wear away tooth enamel.

The good news is, it’s a relatively weak acid. Unless they’re flavored with citric or other acids, seltzers tend to have more neutral pH values than soft drinks like Coke. While bottled flat water has a pH of about 7—or totally neutral—that of Perrier is about 5.5.

The flavorings, though, can bring the pH down, making the beverages even harsher on tooth enamel. One 2007 study in which researchers exposed human teeth to flavored sparkling waters for 30 minutes found the waters to be roughly as corrosive as orange juice. “It would be inappropriate to consider these flavored sparkling waters as a healthy dental alternative to other acidic drinks,” that study concluded.

Bottom line: Carbonated water is gentler on your teeth than soda, but more harsh than water. 

The good news is that La Croix and its ilk are still likely far less damaging to teeth than regular soda. (And one study of various colas, even, found that their exact pH level was only weakly correlated to their corrosive potential.) If you’re drinking unsweetened seltzer, you’re doing better than the avid Dr. Pepper guzzler—at least as far as cavities go.

The amount of seltzer you can safely drink without risking Joker mouth also depends on individual factors, such as how much acid and sugar you consume in your regular diet, your history of cavities, and whether you get enough fluoride from tap water and toothpaste, according to Andrew Swiatowicz, a dentist in Wilmington, Delaware.

“For an average, healthy person, carbonated, sugar-free beverages are not going to be a main cavity-causing factor,” he said. “If you are at all concerned, you can always dilute the carbonated water with regular water, or even just swish with regular water after.”

Good to know, I drink plain soda water from my SodaStream almost daily, my heartburn loves it.

It's really good for heartburn? Or you were being sarcastic?

It is good for heartburn, gets rid of it :)  Maybe similar to alka seltzer?

I couldn't find any explanation but this page agrees that it helps with heartburn:

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