What would cause a white and yellow coated tongue? i brush, floss, rinse and scrape my tongue 3 times a day, it keeps reappearing. what could this be

Oral Thrush?: It could be Candidiasis also called Oral Thrush which is a fungal infection and easily treated. See your own dentist for a definitive diagnosis and treatment if necessary. See: http://www.mayoclinic.org/diseases-conditions/oral-thrush/basics/definition/con-20022381

White tongue : Are you taking any medications? How is your general health? This could be thrush and is something that your primary care should check out for the cause.

See a dentist: It's very difficult to say what it could be without seeing the patient, it could possibly be nothing serious, oral thrush or geographic tongue? See a dentist for evaluation and treatment if needed. Good luck.