There are essentially 2 main categories of facial lines – dynamic and static. Dynamic lines are those produced by the actions of the muscles. For example- the lines we see when we smile. In contrast, static facial lines are those that are present at rest. Typically speaking, there is some component of both lines present – one may have few lines at rest, but these lines become much more dramatic during animation. With that in mind, there are really 2 main forms of treatment for facial lines: Dynamic lines are best treated by Botox Cosmetic – which work by relaxing the treated muscles. This makes sense since dynamic lines are from the movement of these underlying muscles.