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An overgrowth of bacteria normally present in the mouth may cause discoloration of the tongue. These bacteria can accumulate on the hairlike projections (papillae) of the tongue. Some types of bacteria and yeast make red blood cell pigments (porphyrins), which give the tongue a black color. Also, the papillae may sometimes grow profusely, causing the tongue to look as though hair covers it.
The cause of this condition often isn't clear. But it may be related to:
Fungus, following antibiotic treatment, which changes the normal bacterial content of the mouth
Use of medications containing bismuth such as Pepto-Bismol.
Smoking or using chewing tobacco also may discolor the tongue.
You can remove the discoloration by gently brushing your tongue with a toothbrush twice a day. Diluted hydrogen peroxide ? one part hydrogen peroxide to five parts water ? also may help bleach the color. You can rinse your mouth with it or apply it with a toothbrush. Avoid swallowing the solution. Rinse your mouth with water afterward. If this
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