The truth about sparkling water and your teeth
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For most people sparkling water is safe and does not harm bone health. Concerns usually center on acidity. Plain carbonated water is mildly acidic, but research suggests it has little to no effect on tooth enamel compared with sugary sodas. The bigger dental risk comes from added sugar, citrus flavorings, and frequent sipping throughout the day. If you’re worried about your teeth, choose unsweetened sparkling water, drink it with meals, and rinse with plain water afterward.
Source
Ryu HK, Kim YD, Heo SS, Kim SC. Effect of carbonated water manufactured by a soda carbonator on etched or sealed enamel. Korean J Orthod. 2018 Jan;48(1):48-56. doi: 10.4041/kjod.2018.48.1.48. Epub 2017 Nov 19. PMID: 29291188; PMCID: PMC5702778.
Additional Reading
https://www.uclahealth.org/news/article/ask-the-doctors-is-sparkling-water-bad-for-your-teeth
https://www.health.harvard.edu/staying-healthy/does-carbonated-water-harm-bones