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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.
The Coat Next, look at your tongue's coat. ... A thick yellow coating on the back of your tongue could mean you have a bladder infection. And then there's âgeographic tongue.â This sickly tongue will have smooth, bright red spots or patches scraped off its surface, causing the ...