Interesting. I spend a lot of time with people on keto and, did it myself for the better part of a year. I've never noticed a bad breath issue. That could be a myth. It is difficult for me to do keto long term because I don't eat meat and, it gets difficult to push myself to eat fish. (Wimpy vegan, in my heart.) But, I've never noticed any ill side effects for myself or, anyone else, once they get through the first week of sugar detox. Hmmmm...interesting topic.