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you're right, what to do when you've "mouth blisters"?

It burns like hell and I just drink water one after another glass until they become normal again but after a week or so.

Went for checkup they said it's normal just avoid stress

No clue? The limited research I did mentioned it took 'considerable amounts of water' to be a problem. One source said 15 liters, another 25+. I would 'assume' there must be something other than water that could be used as well.