The lady in the lower set had a scooped in nose from
previous surgery. It is most visible on the profile
views. This is common and not unusual.
It was corrected with a smooth rounded implant of
her own cartilage, which will last forever.
Other materials that are used such as collagen will
absorb, and many types of plastic such as silicone
or gore-tex will sometimes change or erode through
the skin, get infected and extrude. Therefore the
persons own tissue when available is always the best