I had small cheek implants put in ten years ago, and then removed six months later with no problems. They were asymetrical; one of them was up too high. They were the small triangular shaped ones, and they were not sewn down as far as I know. I think some plastic surgeons sew them down to keep them from shifting. They came out very easily with much less swelling than the initial operation. My face looked exactly the same as before.(No sagging) If you want to talk further, you can e-mail me at dilamour@aol.com. Good luck.
Monkee