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Yellow Tongue. A yellow coating on the tongue is also caused by inflammation of the papillae, which then collect yellow bacteria. Smoking, mouth breathing, dehydration and fever all cause the papillae to become inflamed.
In combination with the size of the tongue coating, the color of the coating is important as well. 1  A yellow coating is a sign of heat and/or infection in the body, as is yellow phlegm from the nose. 2  A grey or black coating is a sign that itâs time to stop smoking and drinking coffee before your acupuncturist visits.