From article:
“So I woke up with something that’s literally Black Hairy Tongue. People, including my doctor, seem to think it’s no big deal, and will go away soon, but it certainly is gross,” Powell tweeted on October 25.
The Mayo Clinic’s website describes black hairy tongue as a “buildup of dead skin cells” that accumulate on the tongue, explaining that while it can look alarming, “typically it doesn’t cause any health problems, and it’s usually painless.”
https://gizmodo.com/julie-powell-black-hairy-tongue-last-tweet-death-49-1849730851
Black Hairy tongue is a real thing, my brother had it during chemo/radiation treatments.
You can get it by rinsing your mouth too much with hydrogen peroxide.... my dental hygienist told me that after she ripped off a chunk my gum with the hook... rinse with peroxide for that, but not too much or you'll get Black Hairy tongue...