Hairy Tongue:
Information for adults

Hairy tongue, also known as black tongue, is a benign condition of elongation and staining of the fingerlike projections (papillae) on the tongue surface. This condition may be caused by overgrowth of a bacteria or yeast that produces a colored substance (pigment). Anything that reduces the flow of saliva in the mouth, such as dehydration or illness, or if the person is not eating a normal diet, can lead to the condition, which typically develops over a few weeks. Medications that commonly cause hairy tongue include antibiotics, anti-psychotics, anti-depressants, and anti-cholinergic agents. Other causes include smoking, alcohol, the use of mouthwashes, and exposure to radiation therapy.