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A white tongue can happen for many reasons. In many cases, it is linked to poor oral hygiene, dry mouth, or dehydration.
When the tongue is not cleaned well, bacteria, food particles, and dead cells can build up on its surface. This may create a white coating, especially near the back of the tongue.
Dehydration can also make the mouth dry. When there is not enough saliva, bacteria and debris are not washed away as easily.
Another possible cause is oral thrush, a fungal infection that can create white patches in the mouth. This may be more common in people with weak immune systems, diabetes, or those using certain medicines.
Most cases are mild, but a white tongue that lasts, hurts, bleeds, or comes with other symptoms should be checked by a doctor or dentist.
Good oral hygiene, drinking enough water, and regular dental care can help keep the mouth healthy.
