Question Anyone's tongue ever turn black?

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Alcohol can kill of allot of the good bacteria in your mouth, throwing off balance, thereby allowing other creatures that live in your mouth to multiply. Get hydrated, get some good nutrients into your body, and you'll probably see this disappear on it's own.
 
Black jellybeans?
 
As mentioned by @Endler's any Pepto (or similar) the night before? Kind of scared me the one time it happened to me.
No. Had a Cuba Libre and a Cherry Limeade monstrosity the bartender came up with that night after the dive.
 
I thought about food… licorice can turn everything black. But if you brushed your teeth before going to bed we can discount that. 🤔
 
Is your mouthpiece black? Maybe it's just really old and starting to leave black residue as it decomposes?
 

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