Dermal fillers are soft tissue fillers that are injected into the skin to help with smooth out wrinkles, crevices and assists with restoring smoother skin.
The major difference is that anti-wrinkle injections, such as Botox, reduce the activity of the muscle that causes wrinkles. Whereas fillers are used to fill the area (hence the name) where extra collagen (or, oomph) could be beneficial, like lips or cheeks.
This depends on how quickly your body metabolises the filler, but most people tend to come back somewhere between six months and a year.
Maybe you're looking to replace some volume you've lost over time, or maybe you'd just like to enhance what nature gave you. Either way, dermal fillers are a safe, effective way to bring a bit of bounce to your face.
You may wish to ice the area, and it's best to avoid intense exercise for the week after. Stay hydrated, and follow any aftercare advice from your practitioner.