I keep a solution of pure water and H202 (20:1 ratio) on my bathroom sink for oral cleansing. I once had a stomach acid back up so bad I felt as though I had drank battery acid ( not too much exaggerating it was soooo painful), so I ran to the bathroom and sprayed enough of my sol. to gargle with and INSTANT relief. Not 100% but I stopped crying. I did it again and then followed this by mixing 1 TBS acv and 1/2 tsp of organic baking soda. what a life saver!