In the quiet arithmetic of daily habit, what we drink shapes the very structure of our teeth over time. Researchers at Purdue University have now measured what many suspected: unsweetened sparkling water disturbs the mouth's delicate acid balance far less than sugar-sweetened soda, and the mouth recovers its equilibrium within twenty minutes. Presented at the American Society for Nutrition's annual meeting in July 2026, the findings offer a measured reassurance to those who have already made the switch — while reminding us that moderation, not substitution alone, is the wiser path.
Study: Unsweetened sparkling water poses lower dental erosion risk than soda
Saliva quickly restored the mouth's acidity to normal
Mark
So the study shows sparkling water is better than soda. But is it actually safe to drink every day?
Mimi
The research only tracked what happens in the mouth for twenty minutes after drinking. Real damage depends on frequency, how long the liquid stays in contact with teeth, and sugar content. One glass of sparkling water looks fine. A bottle every day might be different.
Mark
Why does soda stay acidic longer than sparkling water?
Mimi
Soda has sugar, which feeds bacteria that produce acid. Sparkling water's carbonation creates temporary acidity, but without sugar to sustain it, your saliva neutralizes it quickly. The mouth has natural defenses—they just work faster against sparkling water.
Mark
The study used only twenty people. Is that enough to trust the results?
Mimi
It's a small group, but they tested each person on all four beverages, which is methodologically strong. It's a proof-of-concept study, not the final word. They're planning longer studies to confirm whether this holds up over time.
Mark
What about calcium-fortified sparkling water? Did that help?
Mimi
It showed a slightly slower pH dip than regular sparkling water, but both recovered to safe levels within twenty minutes. The calcium might offer some protection, but the study didn't measure whether it actually prevents enamel damage.
Mark
If I'm someone who loves soda, what should I do?
Mimi
The researchers aren't saying sparkling water is risk-free. They're saying it's lower-risk than soda when consumed moderately with good oral hygiene. If you're going to switch, unsweetened sparkling water is the move. But plain water is still the safest choice.
Le Pouls
- Tooth enamel begins dissolving when mouth pH drops below 5.5, and soda pushes the mouth into that danger zone far longer than sparkling water does.
- The study tested four beverages on twenty adults and found soda remained significantly more acidic at both the two-minute and twenty-minute marks after consumption.
- Both unsweetened and calcium-fortified sparkling waters caused temporary pH dips but recovered to safe levels within twenty minutes — a recovery soda failed to match.
- Saliva's natural buffering capacity proved surprisingly swift, but researchers caution that real-world risk depends on frequency, duration of contact, and sugar content.
- Beverage makers are now being pointed toward reformulation strategies, while longer-term studies are planned to confirm whether sparkling water truly protects teeth over months and years.
In the quiet arithmetic of daily habit, what we drink shapes the very structure of our teeth over time. Researchers at Purdue University have now measured what many suspected: unsweetened sparkling water disturbs the mouth's delicate acid balance far less than sugar-sweetened soda, and the mouth recovers its equilibrium within twenty minutes. Presented at the American Society for Nutrition's annual meeting in July 2026, the findings offer a measured reassurance to those who have already made the switch — while reminding us that moderation, not substitution alone, is the wiser path.
A new study from Purdue University offers welcome news for the growing number of people who have swapped soda for sparkling water: the switch appears to be genuinely better for their teeth. Researcher Wajiha Zulfiqar and her team tested four beverages — regular soda, unsweetened sparkling water, calcium-fortified sparkling water, and plain water — on twenty adults, using the same participants for each drink to isolate the effect of the beverages themselves.
The results were telling. Soda made the mouth significantly more acidic than any water at both two and twenty minutes after consumption, keeping pH below the 5.5 threshold at which enamel begins to erode. Unsweetened sparkling water did cause a brief dip in salivary pH, and the calcium-fortified version showed a slight decrease at five minutes — but both returned to near-normal levels within twenty minutes. Soda did not.
What struck the researchers was how effectively saliva restored the mouth's chemistry after sparkling water, suggesting that a single glass poses meaningfully less risk than a single glass of soda. Zulfiqar was careful to note, however, that the study captured only immediate effects; real-world enamel damage depends on how often someone drinks, how long liquid lingers in the mouth, and whether sugar is present.
The practical takeaway is clear enough: replacing soda with unsweetened sparkling water, consumed in moderation alongside good oral hygiene, could reduce the risk of enamel erosion. The findings, presented at the American Society for Nutrition's annual meeting in July 2026, also invite beverage makers to explore less erosive formulations. Longer-term studies are planned to determine whether sparkling water's apparent advantage holds over months and years of regular use.
A growing number of people are ditching soda for sparkling water, and a new study suggests they may be making a smarter choice for their teeth. Researchers at Purdue University measured how different beverages affect the acidity inside the mouth, finding that while unsweetened sparkling water does lower pH levels, it does so far less dramatically than sugar-sweetened soda—and the mouth recovers much faster.
The stakes matter because tooth enamel begins to dissolve when mouth pH drops below 5.5. Previous research has established that soda pushes the mouth into this danger zone, but less was known about sparkling water's actual effect on oral acidity. To find out, Wajiha Zulfiqar and her team tested four beverages on the same twenty adults: regular soda, unsweetened sparkling water, calcium-fortified sparkling water, and plain water. By using the same participants for all drinks, they could isolate the effect of each beverage without individual differences skewing the results.
The findings were clear. Soda made the mouth significantly more acidic than water at both the two-minute and twenty-minute marks after consumption. Unsweetened sparkling water caused a temporary dip in salivary pH at two minutes, while the calcium-fortified version showed a decrease at five minutes. But here's the crucial part: both sparkling waters returned to near-normal pH levels within twenty minutes. Soda did not.
What surprised the researchers was how quickly the mouth's natural defenses kicked in. After drinking any of these beverages, saliva worked to restore the mouth's acidity to safe levels, keeping pH above the threshold where enamel damage occurs. This suggests that a single glass of sparkling water poses less risk than a single glass of soda—at least in the short term. Zulfiqar noted that the study measured only immediate changes, and real-world damage depends on how often someone drinks these beverages, how long the liquid sits in the mouth, and whether sugar is involved.
The implications are straightforward enough for people making everyday choices. Replacing soda with unsweetened sparkling water could lower the risk of enamel erosion, particularly if consumed in moderation alongside basic oral hygiene. The research also opens a door for beverage makers to explore ways of reformulating acidic drinks to make them less erosive. Zulfiqar presented these findings at the American Society for Nutrition's annual meeting in July 2026, held outside Washington, D.C.
What remains unknown is whether sparkling water truly protects teeth over months and years of regular consumption. The team plans longer-term studies to answer that question and to investigate whether sparkling water affects other aspects of mouth chemistry that matter for overall oral health. Until then, the evidence suggests that the switch from soda to sparkling water is a step in the right direction—but not a free pass to drink it constantly.
Citations marquantes
Unsweetened sparkling water may be a lower-risk alternative to soda, when consumed in moderation and alongside good oral hygiene practices.— Wajiha Zulfiqar, graduate student in Nutrition Science at Purdue University
Replacing sugar-sweetened sodas with unsweetened sparkling water may help lower the risk of enamel erosion.— Wajiha Zulfiqar
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