He had to put a gold tooth in every mouth so they can track everyone so if anyone left, they could find them. If they try to leave they got shot and were taken to the furnace.There was another dentist that took the tooth out for a price. Benjamin Jacob was so close from getting shot because they found people with no gold teeth, then the unexpected happened. The alarm rang and everyone started running because U.S troops started attacking the Nazis at the concentration camp.After the fight the people were free and they got to tell there story to many people