[jcrben]

I put baking soda in my drinking water, as mentioned at https://news.ycombinator.com/item?id=27329115 - typically 1 teaspoon per liter

[chihuahua]

Doesn't the stomach acid instantly neutralize that?

[hackily]

I sure hope your stomach acid isn't finding it's way into your mouth! The point is to raise the pH in the mouth so your teeth, since acidity causes calcium to leach out of your teeth