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Discolored Tongue
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Overview of Discolored Tongue 
There is normally a balance in the mouth between certain bacteria. Under certain circumstances these bacteria may multiply or other organisms, such as fungi, may grow. These derangements in the microorganisms of the tongue can lead to discoloration of the tongue. In addition, certain chemicals such as bismuth (found in Pepto-Bismol), smoking, chewing tobacco and certain antibiotics can discolor the tongue.
Causes of Discolored Tongue 
Bacterial overgrowth or fungal overgrowth directly affects the color of the tongue. Compounds which are in contact with tongue, such as bismuth, smoking and chewing tobacco, directly stain the surface of the tongue.
Signs and Symptoms of Discolored Tongue 
Discoloration of the tongue occurs for a number of reasons, as cited above. Excessive bacteria often lead to brown or black discoloration of the tongue. Bismuth produces a black tongue. Smoking and tobacco can produce a brownish or black discolored tongue.
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Medical Content Last Updated on 07/12/2008
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