"Does "anything foreign in the body" include silicon chin implants. I have a small hard silicon implant in my chin because my jaw is pushed back. Will my body absorb it?"
In short Loosie I don't know the answer to that one, but I would hardly think so.
I know that tooth fillings can become loose on an extended fast and/or even drop out, but that didn't happen on both of my extended fasts with several Amalgam fillings, and a bridge of three teeth which didn't come loose either.