Biofilm: A coating on the tongue is a common finding. Of course the mouth is not a sterile site, and food passes through - so of course bacteria/microbes may find refuge there. (Think of bad breath). A bacterial mat or biofilm could form. RINSING with water frequently might help-it will dilute out nutrients therefore depriving microbes of food. Then you have BRUSHING (brushing the tongue) to dislodge them.
Answered 7/22/2016
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