Unsweetened sparkling water may be kinder to teeth than sugary soda, according to early research that looked at how different drinks change the acidity inside the mouth.
Why Acid Matters
Tooth enamel starts to dissolve when the mouth’s pH falls below about 5.5. The study showed that sparkling water can lower the pH a little, but not as much as soda does.
What the Study Did
Scientists asked 20 adults to drink four beverages: regular soda, plain sparkling water, calcium‑fortified sparkling water, and plain water. Each person tried every drink so that personal differences wouldn’t affect the results.
Instead of only measuring how acidic the drinks are, the researchers measured the pH of the participants’ saliva right after they drank. This gave a real‑time picture of how the mouth reacts.
Findings
Soda caused the biggest drop in saliva pH. Two minutes after drinking soda, the mouth was noticeably more acidic, and the effect was still clear after 20 minutes.
Plain sparkling water also lowered pH, but only for a short time. The change was seen at two minutes and was almost gone by 20 minutes. The calcium‑fortified version showed a small dip at five minutes, then returned to normal.
In all cases, saliva helped bring the pH back toward normal levels, keeping it just above the point where enamel damage starts.
What This Means
Because the acidity from sparkling water is milder and recovers quickly, swapping soda for unsweetened sparkling water could lower the risk of enamel erosion, especially when the drink is enjoyed in moderation and good brushing habits are followed.
The researchers say more work is needed to see how long‑term consumption of sparkling water affects overall oral health.
Overall, choosing plain sparkling water over sugary soda may be a simple step toward protecting your smile.