Botox is a naturally purified protein that is used to relax the wrinkle causing muscles to help create a smoother more youthful looking appearance.
Botox works by blocking the release of a chemical called acetylcholine by nerve cells that signal muscle contraction. By interfering with the muscles' ability to contract existing expression lines are smoothed out and in some cases they disappear once the Botox has taken full effect.
Botox is injected directly into the target muscle and usually lasts 3-4 months.
First things first: Dermal fillers aren't the same as neurotoxins like Botox and Dysport. The latter type "freezes" muscles to reduce wrinkles, while fillers smooth out skin by filling wrinkles.
Collagen used to be a common filler, but these days most fillers, such as Restylane and Juvederm, use hyaluronic acid. Thanks to its ability to store moisture, hyaluronic acid is responsible for giving skin a plump, hydrated look. It's used topically to moisturize, but a cream or serum can't restore lost volume—only injectable hyaluronic acid can.
Once injected it can add to the natural plumping action or replenish your body's natural production of hyaluronic acid, which diminishes as you age.