There is no dispute. Both doctors and more than 3 million patients who underwent 

BOTOX® injections in 2004 (as reported by Allergan) agree that Botox is effective in treating frown lines and crow's feet.

Today, in the hands of an experienced injector, Botox can produce results that allow for some natural movement, yet still produce exactly the desired effect on wrinkles and furrows. Moreover, in the hands of a highly skilled injector, BOTOX® should be a nearly painless procedure. While there is no downtime, results are typically visible in two to three days but may take up to a week to fully develop. Those results usually last three to four months or more. Side effects are rare, including a mild post-injection headache. But if you are like most recipients, you'll experience a blissful break from headaches. In addition, there is a minor risk of experiencing a sometimes reported flu-like condition, which could be related to the Botox treatment or a result of encountering a virus.

BOTOX® is presently the only FDA-approved neurotoxin for cosmetic use; in the past there was Myobloc, which is no longer marketed in the United States.