They can become dark and lead to "hairy tongue" in up to 13% of the population. They turn brown, black, or even white, pink, or green, in color. Typically, hairy tongue does not cause pain.

Purple or bluish: A purple tongue can indicate poor blood circulation or heart problems. Kidney disease or respiratory issues ...

Chronic infections, inflammation, and even gum disease can stem from neglect. Over time, your mouth can become a breeding ...