Above all remember that wrinkles are folds that form in the skin due to contraction of facial muscles. These expression lines appear because we repeat successively different gestures that contract the muscles of the region, causing the overlying skin loses firmness and wrinkle.
Injecting small doses of Botox with very fine needles, it manages to block the nerve impulse that reaches the affected area and prevent muscle contraction. As a result, the skin remains smooth and not marked lines and furrows.
It is important to note that injections do not affect or take away facial gestures naturally, just make the muscles remain relaxed and stretched skin.