A study found that unsweetened sparkling water lowers oral pH less than soda sweetened with sugar. The effect of unsweetened sparkling water on acidity inside the mouth, however, has received less attention. Researchers compared sugar-sweetened soda, regular sparkling water, calcium-fortified sparkling water and plain water in 20 adults. Regular unsweetened sparkling water produced a temporary decline in salivary pH after two minutes, while the calcium-fortified version caused a decrease after five minutes. “Our results suggest that replacing sugar-sweetened sodas with unsweetened sparkling water may help lower the risk of enamel erosion,” said Zulfiqar.