Please Explain: Botox

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Botox is the most common cosmetic procedure in the U.S.. In addition to erasing wrinkles, it’s also sometimes used to treat migraines and excessive salivation, among other conditions. Find out what Botox is, and what the risks and benefits are. Dr. Paul Greene is Associate Professor of Neurology at Columbia University; Ewen Callaway is Biomedicine reporter for New Scientist magazine.