Replied by Ted (Bangkok, Thailand)
Daryl: If you add water about 1/2 glass of water the solution would be diluted enough not to effect the teeth. I had some reports of a person who did not add water and had problems with teeth sensitivity of acid reflux flare up. The problems disappeared after diluting the solution in some water. The minimum is 1/2 glass of water.
There appears to be no much limits as to how much apple cider vinegar be taken provided that sufficient amount of baking soda is added. The limits to how much you can take invariably is determined by whether the bowels go into a diarrhea should too much be taken. For some who take apple cider vinegar straight, that may lead to worsening acid reflux, if they do have a bad one. The middle of the line is take as much as you want as long as the urinary pH is within the pH of 7. is o.k, or at least 6.6-7.0, but ideally it is 7. Taking too much where urinary pH exceeds 7.5 is not recommended, it usually leads to a sure watery stool. That is the maximum limit. It is not the dose, it is how the body reacts to that dose, using the urinary pH as a gauge. If you want to be precise, then get a cheap pocket pH meter to do that. I used them all the time to gauge my health, especially when I am sick.
One possible exception where that is desireable is constipation, and a terrible flu, where the body invariably needs 2-4 times the normal dose whenever a cold strikes the body, and reaching a urinary pH during that period of 7.0, at the very least is not easy.