I have a white coulored build up on the back of my toung, what is? i brush regularly and use mouth wash, i have found that i can scrap it off it retur

Oral thrush: Its oral thrush, fungal infection, people who are immunocompromised get it and also if you had any recent antibiotics can give you thrush, treatment is antifungal swish..

Plaque: The white buildup on your tongue is probably just plaque. This is the same plaque that forms on your teeth. Brush your tongue when you brush your teeth or use a tongue scraper.