That would be because all of the fungus and rotting food particles left in your mouth and growing on your tongue. You need to brush you tongue very well if this happens. Maybe even consult a doctor.
Plack
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If your tongue is white, you might have thrush, a fungus infection. Everyone has some thrush in their mouths. It helps with digestion. You can have too much and it will turn the inside of your mouth white.
It's possible what you are describing is not your tongue's tastebuds but a condition called thrush. Thrush is an infection caused by natural yeast that causes your normally pink tongue to turn white.
Prehapes you smoke? Builds a residue overnight sometimes. Also It may be something like cotton mouth?. Have this a few times a month
A white tounge means that you are either sick and not getting enough fluids in your system. Or you have to much yeast in your body.
-Gore
Because you ate something a while ago that coated your tongue, and the bacteria in your mouth like it, and so have proliferated on your tongue. Totally normal.