I think you need to read up a bit more on oil pulling. To me, it doesn't seem like you know a lot about it. I would never swallow my oil because Dr. Karach said not to, due to the toxins. Before I started pulling, I did my research.
Earth Clinic has a section dedicated to oil pulling. It does mention something about heavy metals being removed by oil pulling. I don't think it would be mentioned there if it weren't true.