I am in the same boat as you. I've been dealing with this white tongue for about 2 1/2 years. I thought it was candida and parasites but my stool sample results came back negative. I too did the anti-candida diet for 90 days and saw no change. It doesn't seem to matter what I eat as my tongue stays the same.
I am now using celtic Sea Salt a few times a day b/c i do have an Iodine deficiency. I am also taking Betaine/HCL and B vitamins.
I also did some allergy testing and have been avoiding all of the foods that came up on the allergy test.
I am wondering if I could have a bacterial infection somewhere or if my liver is overworked and that is why I have a white tongue. Just some ideas. I've been trying to desperately figure this out for years.
BTW--did you always have a white tongue or did yours suddenly appear one day. I got mine after I had food poisoning in Hawaii (I took levaquin too) and then my naturopathic dr. put me on another natural Antibiotic when I got back vs. building my immune system back up with probiotics..(don't go to him anymore). Anyways I've tried anti-parasitic meds., anti-fungals, natural Antibiotics , okra pepsin, digestive aids, many probiotics, fermented foods, you name it...I've tried it.
I too feel pretty healthy but have this silly white tongue. The naturopathic dr. I was going to before said he thinks I have a "deep" bacterial infection in one of my organs...wouldn't I be feeling worse if I did? Any thoughts are appreciated.
The new dr. I'm going to is trying to build my immune system up as my white blood cell count is low. I am also hypothyroid and have some hormone imbalanaces. He feels like if he can get my body back in balance I'll be able to fight off things naturally. It sure sounds good but I'm not sure what to think of it.
I decided to respond to your message b/c it sounds like you are dealing with the same frustration I am over this.