The toxin is injected serially into a group of muscle which controls frowning and wrinkling with a very fine needle attached to a small syringe.
When treating frown lines the toxin is injected to a group of muscles just above the eyebrows. The toxin is also injected into a muscle at the bridge of the nose.
When treating crow's feet the toxin is injected serially at several points into the muscles causing the wrinkles at the sides of the eye.