Also, at some point between 10 and 13, and amalgam fell out of my tooth after brushing my teeth in the morning. I can remember holding it in my hand and it crumbled between my fingers. I can't remember what I did with it, whether I kept it to show my parents, binned it or flushed it down the sick. But I went back to the dentist that day and she put another filling instead of it. I wonder if that was the last straw that made me OCD? I don't know, and I can't remember the chronology of those years. But I think I would have got a lot of exposure by having it in my hand like that and then her drilling and putting another one in without any precautions?