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The same thing happened to one of my professors once. He went to provide aidAids Aids - resources Early symptomatic hiv infection to a country in South America and got sick and took Pepto Bismol. He told the story of his black tongue and he knew why it happened, but, I can't remember the cause. Sorry, but, at least you know that it does happen to other people. He had no bad lingering affects from it. I'm sure someone else will chime in with the cause.
It's an airborne fungus. If you sleep with your mouth open and an open window in the bedroom, you will eventually have a black tounge at least once in your life, especially if you live in a humid climate. When my wife and I were newlyweds, we woke one morning to black tounge. We both kind of looked at the other like,"what did you give me?" We promptly educated ourselves and let the other off the hook.
I feel strongly it's the Pepto Bismol. I used a generic and bingo, the next morning...black tounge. My sister is a nurse and could not explain it, and Pepto sounds like the culprit!