Today we are discussing on Black hairy tongue. Black hairy tongue is caused by bacteria or fungi in the mouth, which make the tongue, appear black and hairy. Black hairy tongue is a temporary, harmless oral condition that gives the tongue a dark, furry appearance. Certain lifestyle habits and conditions like poor oral hygiene, smoking tobacco, drinking a lot of coffee or tea, using etc can make people more likely to develop black hairy tongue. Other than the appearance of the tongue, most people with black hairy tongue don't have any symptoms or feel any discomfort. Practicing good oral hygiene is the best way to treat black hairy tongue. Gently brush your teeth twice a day with a soft toothbrush. Also, brush your tongue. You can use a tongue scraper to make sure you're thoroughly cleaning the area. Drink plenty of water throughout the day to help keep your mouth clean.