How long does the effect of fillers last?

I'm worried about my facial volume these days, so I'm looking into fillers.

I became interested because I heard that a lot of people get fillers on their forehead or jawline.

I'm curious if getting fillers gives a natural plumping effect or if it's noticeable.

You know there's a saying like that.

Fillers remain under the skin, so if you get too much, they clump together...

Is that really the case?

I've heard that the duration of fillers varies depending on the type, so I'd like to know how long they usually last.

I would be disappointed if it ended too quickly, but it would also be a burden if it lasted too long, so I’m wondering what the appropriate duration is.

I am also worried about the extent of side effects, such as pain, swelling, and bruising, when getting fillers.

Since this is my first time getting fillers, I'm worried that too much might be injected and it will look unnatural, so I'm wondering if it tends to turn out naturally.

Please let me know if you’ve had filler treatments!