Acidic drinks, even when sugar-free, can dissolve tooth enamel. If you brush your teeth immediately afterwards, you’ll wash away the enamel minerals that the drink has dissolved. If you wait for at least 45 minutes, your saliva has a chance to do it’s best to replace some of the dissolved minerals. New Colgate Sensitive Enamel Protect toothpaste has a dual action which strengthens existing tooth enamel and protects sensitive teeth day after day.