Thin white layer on tounge from nasal drip how do i cure it?

Causes white tongue: The tongue is known to have many variations with pigmenting, size, appearance, & not always due to disease. Causes of a tongue that looks white include: lichen planus (responds to steroids), white sponge nevus (familial, benign, permanent), smoker's leukoplakia (2% risk of cancer, needs biopsy), hairy leukoplakia (due to epsteinbarr virus), warts (due to papillomavirus), "thrush" (rx antifungals).

Nasal breathing: you have a nasal drip because you are breathing through your mouth. commit to being a "nasal" breather. stop sighing, yawning, chewing gum,(these are all forms of hyperventilating). is your nose is blocked there are many you tube videos about nose clearing(see buteyko breathing). you will also need to tape your lips together before bed to insure they do not open while asleep.