Why is my tongue brown?

A brown tongue can be caused by several factors, including poor oral hygiene, which leads to the buildup of bacteria and dead cells on the tongue's surface. Consumption of certain foods, beverages, or medications, such as coffee, tea, or iron supplements, can also contribute to discoloration. Smoking and dry mouth may further exacerbate the issue. If the discoloration persists or is accompanied by other symptoms, it's best to consult a healthcare professional.