Streptococcus mutans can cause cavities even on a zero-carbohydrate diet by feeding on other food components.

“so the key thing to understand here is that cavities form form not from foods not from sugars per se but from strep mutans and other bacteria that eat those sugars and create acid hence the critical need to keep your mouth as alkaline as possible which does not mean that you can never drink some lemon water or coffee or tea”