In some cases it can be saved. A Tate L Viehweg wrote something regarding this. If its a long standing implant suddenly failing it usually means the prosthetic is not correct (crown, bridge, denture) and caused the bone loss. Maybe that is why you were clenching? It depends on how how much bone loss occurred. His paper states that the gum around the implant needs to be detoxified - as I understand it in some cases a bone graft, gum scaling and/or a change in prosthetic, not necessarily in that order, may save it. After these treatments fail and the implant remains mobile the implant has to be removed. I just had all 6 of mine removed after 15 yrs due to frequent infections on recent bone loss. Only one was wiggley - but I figured eventually they would all go. Wish you well.