The question missing there is: do small amounts of lactic acid fulfill a function, and if so, what happens when there's no more of it in our mouths? Will this h

The question missing there is: do small amounts of lactic acid fulfill a function, and if so, what happens when there's no more of it in our mouths? Will this have consequences on our digestive system? It sounds to me like they're focusing on one thing only and not thinking systemically enough.