The 64-year-old from Ohio suffered the embarrassing condition for two weeks before he went to hospital.
Hairy tongue, known medically as lingua villosa, is caused by a build-up of dead skin cells on the part of the tongue covered in taste buds.
The latest case was documented in the New England Journal of Medicine.
The man had completed a course of clindamycin for a gum infection 21 days before he went to hospital for hairy tongue.
His tongue started to change colour two weeks before he went and doctors initially thought he was suffering a fungal infection in his mouth.
But after he was examined at hospital, doctors found he had developed long papillae— a symptom of hairy tongue.
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Article URL : https://www.thesun.co.uk/health/23031339/green-hairy-tongue-smoking-antibiotics/