If you look in your mouth and see dark metal - they are amalgam fillings. If you see gold then it is gold. If you see what looks mostly like your other teeth light/white in color then you have composite fillings. The dark metal are the ones you really need to be concerned about - or if you have had a root canal you want to ask your dentist if the hole was filled with amalgam after the root was removed. I hope this clears it up for you @lasseehlers.