When drinking anything in large amounts (apple, lemon) swoosh your mouth out with 1 tsp baking soda stirred up in 1/2 c of water. This swooshing will alkalize your mouth and get rid of the sensitizing acid!
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*lots of healers say very good things about distilled water - if you're using it for a specific purpose - it's good to make herbal/healing tea out of distilled water because it will really suck the needed nutrients out of the herbal tea and into the water...and thus, into YOU. I've just begun to research this.*