It means you have bad breath and you need to brush your teeth.This happens when you don't brush after a meal.Also my older brother has this, and he can peel it of because he doesn't brush when he has no school.
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This is called 'Leukoplahia". It is usually caused by some kind of irritation in the mouth, such as rough edges from dentures, or smoking tobacco. People who have AIDS can also get it. And in rare cases, it can be a sign of oral cancer. Best thing to do is quit the thing that is causing it, i.e., quit smoking or smooth out rough spots on the dentures.
It might be a good idea to see a dentist or doctor to be sure.
Bacteria that grew while you slept. Brush you tongue as well as your teeth, but don't get carried away. Gently .
Possibly 'thrush' depends on whether it's a person, animal??? Some babies get thrush, and it's a white coating on the tongue.
There is plaque on your tongue, you can usually rid of it by brushing your tongue with a toothbrush.