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Usually the black tongue is harmless and also a temporary condition, but if it persists for more than 10 days , then it is of concern and should be evaluated.The common causes for such black film on tongue are-1. Not maintaining oral hygiene . 2. Due to medications which have bismuth for eg. Pepto-Bismol 3. Use of Heavy tobacco 4. Recent use of antibiotic. 5. Long term usage of astringent agents or mouthwash. 6. Overgrowth of bacteria or fungi in mouth.In case, if this persists for 10 days or more , please get it evaluated.
If the black tongue is persistent, then doctor may take a culture of the black growth on the tongue to find out what it is, and recommend a medication to manage it.You can use a tongue scrapper, maintain oral hygiene. You can wait for 7- 10 days, if it doesn't improve please see your doctor.
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