Can help you with the next course of action and treatment plan. Would like to discuss in details and provide apt solution. Kindly consult.

Black tongue is a harmless and temporary oral condition.  Black tongue usually occurs due to a buildup of the protein keratin on the tongue’s surface. However, an overgrowth of bacteria or fungi within the mouth can also cause the tongue to appear black. Black tongue is temporary and tends to clear up without treatment. Common underlying cause can be Poor oral hygiene Drinking coffee or black tea Smoking and other forms of tobacco use Recent or prolonged use of antibiotic Having a weak immune system due to a medical condition, like diabetes or HIV