Eat fermented foods and drink probiotic beverages to bring your inner ecosystem back into balance. 1  Use the Principle of 80/20 at every meal. 2  Warm up your digestion with cooked foods. 3  Add herbs and spices to improve digestion. 4  Drink warm ginger tea 20 minutes before a meal to benefit digestion and relieve nausea.
A black hairy tongue is caused by too much bacteria or yeast growth in the mouth. The bacteria build up on tiny rounded projections called papillae. These lie along the surface of the tongue. Instead of shedding as they normally do, the papillae start to grow and lengthen, creating hair-like projections.
Most often that color is black, hence the name. But the tongue can also turn brown, yellow, green, or a variety of other colors. Certain lifestyle habits and conditions can make people more likely to develop black hairy tongue. They include: 1  poor oral hygiene. 2  smoking tobacco. 3  drinking a lot of coffee or tea.