★★★★★
Hi, have had a coated tongue for years (33 yo) and don't know why. Brush it every night gargled, use salt, have a healthy diet blah blah blah.
I've recently (2 months ago), having read of the dangers of parabens and Sodium Laurel Sulphate, stopped using all cleansing products apart from a little, food grade shower gel on armpits, groin and bum. I extended this to toothpaste 2 days ago, I now use one with aloevera and teatree oil in. My tongue has gone clean!
Also, in this time, my very mild but persistent 'bacne' has cleared up, my forehead bumps have gone down, and I'm regrowing little hairs on my, sadly, thinning pate.
I think I was allergic to the chemicals.