Botox is a cosmetic injection that is made up of Botulinum toxin type A, a purified substance that works by blocking the nerve signals to the muscle in which it is injected. When this signal is blocked, the muscle cannot contract, smoothing lines and wrinkles. Botox is most commonly used to smooth forehead lines, crow’s feet, and lines between the eyebrows. However, it can also be used to diminish the appearance of neck bands and skin dimpling on the chin. Results from Botox can last from 3-6 months before a touch-up appointment is needed.