Somebody found you could end all cavities by changing the bacteria in the mouth. Sugar tends to make my teeth feel all funky. I pour and swallow and mostly dodge the teeth with most of what I drink, and even doing that, if I drink a Coke, my teeth feel nasty. Unless the sugar is getting in the saliva and getting on the teeth, it seems to be an internal change that's taking place. This stuff tends to be bad for the gums. I would recommend flossing once per day to improve gum health as well.