What was my root cause? The evidence led us to conclude that heavy metal poisoning and resulting severe inflammation triggered my Hashimoto’s. During the summer of 2008, I had a large amalgam filling removed from one of my molars. The dentist didn’t take the proper precautions during the very long procedure. For three hours I breathed the vapors as he drilled the amalgam from my mouth. Amalgam is approximately 50% mercury . As soon as I sat up, I felt sick. I stumbled out of the office and spent the next week mostly in bed, exhausted and without energy. My health quickly deteriorated from that point on.