My forehead and nasolabial folds look sunken, so I would like to know exactly how the filler works and how long the effects last first.

As I get older, my forehead and nasolabial folds look sunken together, and my wrinkles are deepening, so I am seriously considering fillers. When I look in the mirror, I look more tired than before, and wrinkles are the first thing that catches my eye when I take photos. So, I am researching the effects and duration of fillers, focusing mainly on hyaluronic acid fillers. While the immediate volume-boosting effect right after the procedure is appealing, I am also worried that it might look unnatural. I have heard that domestic fillers generally last 6 months to 1 year, while imported ones last 1 to 1.5 years, so I am currently just looking at the general framework.

However, since natural facial expressions and lines are the most important to me, I would prefer the filler effect to simply make me look "well-conditioned" rather than being too obvious. When planning fillers primarily for the forehead and nasolabial folds, I am curious about which areas to inject small amounts into and how to adjust the effect so it is not excessive, especially since this is my first time getting the procedure. I am also confused about when to schedule a follow-up treatment based on the filler's duration: is it better to get a touch-up before the filler completely wears off, or to start over when it has almost completely disappeared? Finally, could I get information during the consultation regarding the types of fillers commonly used for the forehead and nasolabial folds, the cost per session, and the approximate price range for filler packages?