Once I experience contouring injections, do I keep getting them?

My facial lines looked duller than before, so while looking for ways to manage them, I learned about contouring injections.

At first, I thought about getting it done just once, but now I'm worried about whether I'll have to keep getting treatments afterwards.

For those who received it in person, was the actual experience similar to what you initially expected?
I am also curious if you continued with additional care after your first experience.