I don’t have anymore metal fillings but I had a bunch when I was a kid. It was quite a shock the first time I accidentally bit a piece of aluminum foil. I got a tiny electrical jolt in my mouth and spit my food all over the dinner table. I was a little freaked out because nobody told me it could happen. Once I understood what was happening I thought it was entertaining. I tried out all different kinds of foil. Chewing gum wrappers gave a very mild buzz.