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I believe it's much more about nutrition, though there is a difference in oral microbiome too. Explanation at https://wholehealthsource.blogspot.com/2010/12/dr-mellanbys-... (The author, Stephan Guyenet, is not a carnivore-diet proponent afaik.)

Immediate contact and for quite a while until you brush again. Leftover sugars are turned to acid by mouth bacteria.

The diet angle is just sugar and carbs.