Multiple choice Black hairy tongue appearance is due to _____________. filiform papillae fungiform papillae filiform and fungiform papillae circum vallate papillae Reveal answer Fill a bubble to check yourself A Correct answer Explanation Other names for hairy tongue are: Lingua Nigra Lingua Villosa Lingua Villosa Nigra It occurs due to hypertrophy of filiform papillae on the dorsal surface of tongue, due to lack of mechanical stimulation and debridement.