Botulinum toxin type a commonly known as botox involves a series of targeted injections that relax the muscles where their activity causes lines and wrinkles eg laughter lines frown and worry lines across the forehead and the brow it blocks the impulse from the nerve to the facial muscles reducing the contractions that cause wrinkles the effects can last from three up to six months at which point you can book a top up treatment clinical studies indicate that this treatment has a cumul