Dental

Got a old filling prepared for a temp crown yesterday. It had a silver filling in it. A old old one was starting to break down. But I’m scared bc I shouldn’t have read online but they did mot use a rubber damn because I couldn’t use it and also the silver filling filled down to fit temp crown. Should I be worried of the gray dust stuff had in my mouth even after rinsing it out and always having them rinse and suction was fine. Just worried bc of the Mercury I heard are in silver fillings. And had some silver stuff after in my mouth. Help worried.