Why is my tongue black?

A black tongue can occur due to a buildup of dead cells, bacteria, and food particles on the surface of the tongue, often linked to poor oral hygiene. Other causes may include smoking, certain medications, or dehydration. It's usually harmless, but if it persists or is accompanied by other symptoms, it's advisable to consult a healthcare professional for proper evaluation. Regular brushing of the tongue can help improve its appearance.