Is it common for forehead fillers to be finished after just one session?

While looking into forehead fillers, I became curious whether I need to get them multiple times like skin care, or if I just get one procedure and wait a long time to see the results.

I don't have any experience with fillers, so I'm a little scared to get a large amount injected all at once.

So, I’m thinking of getting a small amount of forehead filler initially to maintain a natural look, checking the shape, and then adding more if needed.

Even in this case, is there a specific recommended number of forehead filler treatments?

I am curious if it is common to complete the design in one go, or if first-time recipients sometimes review it in two stages.

I prefer it to look as natural as possible rather than creating perfect volume right from the start lol

Is it possible to wait until the swelling completely subsides and the shape settles after the first treatment before deciding whether to have additional treatments?

In that case, I am also curious about how long we have to wait before watching it again.

Rather than there being a fixed recommended number of forehead filler sessions, it seems to vary depending on the volume the individual desires and their current shape.

I do not want to repeat the procedure multiple times and inject a lot; I want to keep it to a minimum.

I'm curious whether many people who got forehead fillers for the first time were satisfied after just one session, or if there are more who felt their results became more natural after having a small amount added.

Also, if the volume decreases over time, I would like to know if it is a matter of receiving it again from the beginning or if it is supplemented only as much as necessary.

Experienced users, please let me know the recommended number of forehead filler sessions and how many you actually received. ^^