What make your tongue white?

I woke up this morning and it's completely white. Can someone give me a clue?What make your tongue white?
Oral thrush. Or even Milk can hand down a white film on your tongue.
Plaque can clear your tongue white - does it go away when you brush your tongue?
microbes
What have you beeen doing.
monilial infection possibly. Is near a chance you could be diabetic, or own you taken an antibiotic?
i heard have an eating disorder could produce ur tongue white. but that could be total bullcrap. I just hear it somewhere.
melted marshmallows