Hi Dr.Diana, I just watched your video on immune system challenged and I just did the spit in the glass of water and then I had my son do it. Mine looks a little worse than the photos you showed in the video very ummm.. like webbed from the top down to the bottom of the glass very very weird ha! then my son did it and his did absolutely nothing the water is clear. I also have a white coat on my tongue and have for awhile now no DR has ever said anything about it. Ha I wish I could have sent you a photo of mine its not as bad as you described your families. but it is way worse than the 2 photos on the video.