evidence: - Sports drinks: Sports drink companies use fit, muscular athletes to advertise their products, but what they don’t advertise is the amount of sugar they contain. A 32-ounce bottle often has 56 to 76 grams of sugar, which equals 14 to 19 teaspoons, and the pH level of a typical sports drink is around 2.9. - Bottled water: The brand of bottled water you buy makes a surprisingly big difference when it comes to acidity. Common brands like Dasani and Aquafina are actually acidic enough to be harmful to your teeth. Look for bottled water with a pH level between 7 and 9. Some of the best brands include Essentia, Evian, and Fiji. [...] - Water: Water is truly the only beverage your body needs to survive, so the more water you drink, the better. Filtered tap water and bottled water with a healthy pH level will pose no problems for your teeth. Plus, staying hydrated allows you to produce healthy amounts of saliva. Tap water containing fluoride, which is fairly common today, has the added benefit of strengthening the enamel of your teeth.