Inquiry regarding forehead filler volume to improve a flat and curved forehead line

My natural forehead shape was flat with prominent bones and a sunken middle, so I have lived my whole life covering it with my bangs. I really want to try a hairstyle where I sweep my bangs back this year, Every time I look at my profile, my confidence drops because of my flat and uneven forehead line. I am wondering if it is possible to create a three-dimensional forehead by smoothly filling in the sunken central area with forehead filler treatment at Maypure. Since the forehead is a large area, I am very worried about potential side effects, such as the surface becoming uneven or the filler sliding down after injection. I would like to consult on the approximate recommended dosage and the duration of effect for each product, as well as how many cc should be injected to create natural-looking volume without appearing artificial, especially for someone with a forehead as curved as mine.