From the world’s toughest tongue twister (“Pad kid poured curd pulled cod”) to childhood classics (“Sally sells seashells by the seashore”), tongue twisters are aplenty in the English language.

Generally speaking, a tongue’s color will fall somewhere between a pale pink and dark red, with a thin, white-ish layer of keratin on top.Photograph: 4FR/Getty Images Once, at a party, a woman said ...

That pink muscle in your mouth isn’t just for tasting ice cream and awkward first kisses. Your tongue might be the most overlooked diagnostic tool in your entire body—a health barometer that changes ...