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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.
A Answers (1) Follow Following Unfollow Pending Disabled. A Dr. Mehmet Oz, MD , Cardiology (Cardiovascular Disease), answered. Check your tongue in the mirror. If you notice a white, yellow, or orange coating, it could indicate acid reflux, which, in severe cases, can lead to esophageal cancer.