Well actually, I have almost half a dozen composites in my mouth, and I don't think I'm allergic to this material, I used to have silver fillings,which I was not react to either. It just thinking of composites release those formaldehyde and BPA things makes me sick. And as you mentioned, even gold fillings is not pure gold, it contains palladium which is not good for health, so now I'm really don't know what to go with. It's a small cavity on the side of one upper molar.