Tried everything but can't seem to get rid of coated tongue.

I have a coated tongue especially first thing in the morning and after eating although it can be scraped off it is quite thick. I have regular bowel movements and have tried everything inc regular probiotics and a liver flush. Also one thing to point out is the coating is mostly at the rear and almost looks like teeth marks towards the edges. Is there anything else I can do to get rid of this? Tweet