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A white coating on your tongue, especially on the back, could be caused by post-nasal drip. The tongue can get coated with bacteria-rich mucus, giving it a white appearance. You can gently brush your tongue with your toothbrush or use a tongue scraper to reduce the coating and any odor associated with it. If the problem won't go away, see your dentist. You could have a condition such as oral thrush, caused by an overgrowth of fungus.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.