what does a coated white tongue mean
A coated or white tongue occurs when the surface is colonised by bacteria or fungi, and dead cells become trapped between the small nodules on the tongue.A coated tongue isn't a disease and isn't usually a sign of anything serious. It's usually only temporary.ral thrush is a yeast infection in the mouth caused by a fungus. It can cause a burning sensation on the tongue as well as sore white plaques that can be scraped off (although it may sometimes appear as a red patch). You are more likely to develop oral thrush if you: 1  have diabetes.