My dental hygienist told me today that a low-carb diet will give me periodontal disease. She said that the carb digesting enzymes secreted during the eating process do not know what to do when we don't eat carbs, so the enzymes turn into sugar and cause mouth bacteria.
Never heard that one before...
I told her that my periodontal issues had greatly improved since giving up grains/sugar. She said that they will get bad again if I don't eat carbs. (I've been mostly Paleo for 3 years now.)
I didn't bother to argue. What's the point? She is convinced she is right.