Does the feeling left on the face change over time?

When considering getting fillers, my biggest concern is the duration of the effect.

I was satisfied at first, but as time went by
I wonder if the process of the volume gradually decreasing is natural,
I am curious if there are cases where the shape suddenly changes at some point.

For those who have actually maintained it for a long time, I would like to know how the feeling differed from the beginning to a few months later.