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They include: poor oral hygiene smoking tobacco drinking a lot of coffee or tea using antibiotics (which may disrupt the normal balance of bacteria in the mouth) being dehydrated taking medications that contain the chemical bismuth (such as Pepto-Bismol for upset stomach) not producing enough saliva regularly using mouthwash that contains peroxide, witch hazel, or menthol getting radiation therapy to the head and neck Black hairy tongue is more common in men, people who use intravenous drugs, and those who are HIV-positive

2014 is the 50th anniversary of The Surgeon Generals Report on Smoking, which for the first time outlined the potential hazards of smoking

Avoid rinsing too vigorously, as this can disturb the blood clot

[1] Tobacco and sleep apnea Smoking can cause or amplify obstructive sleep apnea-hypopnea syndrome (OSAHS)