I still don't know what the stains were from and my doctor didn't know if it was a fungus or from red wine at a restaurant, but I had a black tongue for many days that was not going away. On a whim I tried Listerine from my husband's sink, and it worked. In less than 48 hrs the stain was gone. It also has killed many a sore throat in our household.
Yes, I'd recommend this product