I'm curious about the features and advantages of fillers.

I am in my 30s and stressed because my nasolabial folds make me look at least five years older. The lines become more distinct every time I smile, so I can no longer laugh freely, and even slathering on functional cosmetics doesn't seem to help. People around me have strongly recommended fillers, saying that one of their key advantages is that they instantly fill in sunken areas. They claim that volume fills in immediately after injection, making the facial lines smooth, and I am curious if this is really true. I am concerned that the ingredients might shift within the skin, potentially causing the shape to become distorted or uneven. I would like to hear honest opinions from those who have consistently received filler treatments for their nasolabial folds. I would also appreciate it if you could tell me the typical treatment schedule to ensure the filler maintains its beautiful shape for a long time.