You may be onto something re: metal toxicity. I have the ingredients for Bentonite clay packs already and will try to throw them into the mix. Way back a naturopath said my problem was actually metal toxicity in the gums causing immune system problems. He said to rub the clay mixture into the gums daily 5x, then sit in the sun for a few minutes afterward. And also to use neem bark/oil on the gums 2x per day to kill pathogens. I did it for a while, and don't recall why I stopped.
JAB
I don't think a little clay on the gums is going to cut it. The clay might pick up some metals from the gums but it won't do much else. If I were you I would use the chelation formula in the link I gave you.
I'm glad you were able to find your cure, it seems, so easily. It's hard to not be jealous when I hear stories of someone finding taking 1 item and they are cured. Maybe it wasn't that simple.
JAB
I don't know if I'm cured but so far as long as I keep taking it my allergies are way better. I mowed the lawn yesterday and still no allergies without taking anything.