Hi There. Ive Got White Tongue. No Scraper Or Mouth

Hi there. Ive got white tongue. No scraper or mouth wash helps. Hydrogen peroxide helped a little bit at the beginning but doesnt work anymore.
Is it candida, thrush etc?..
I also have dry mouth. Often need to sip water and chew gum.
I dont feel any reflux or problems with stomach. But maybe it is a silent reflux?.. I was encouraged to use Omeprazol but not too sure about it. Dont want any side effects. Besides it would be only fighting symptoms but not cause. What could be the real cause of this condition?
Could it be caused by sipping whey protein at the gym?