This morning, much to my amazement, I woke to discover that I had a black tongue!!! At first I freaked out...but then I Googled it! Here's what I discovered...
Bismuth is the active ingredient in Pepto Bismol. When it comes into contact with trace amounts of sulphur in your saliva it combines into Bismulth sulphide which is black. This stain can last for up to a couple of days.
Read more at this discussion board!
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