most white fillings do contain it, or they did, anyway a few years ago. the other materials you have to study the MSDS on many of them. some list what they have and what they don't on the internet. people can get a biocompatiblity test to see how reactive they are to them. generally the ones less toxic will be listed as least reactive. you cannot go by that statement (not speaking of the report itself, as it is pretty accurate) 100%, but it is pretty close to accurate with many materials.