White tongue is a term used to describe any area of the tongue that has a grayish-white coating on it. The entire tongue may be coated, or the coating may appear in patches.
There are a few different reasons for a white tongue, and each has a specific treatment. A white tongue is usually a harmless symptom but, in rare cases, it can indicate a serious condition.
The most common cause of a white tongue is poor oral hygiene. Small bumps on the tongue called papillae can start to swell up and become inflamed in a mouth that is not cared for well.
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Souce: Youtube / Dr. Eric Berg DC