How botox works

When botulinum toxin is injected into the muscle, it spreads to the nerve terminal and prevents a neurotransmitter from releasing, stopping muscle activity. This site-specific paralysis smoothes wrinkles and stops spasms. Botulinum toxin also prevents the release of pain and inflammatory mediators - an effective way to treat migraines.

But the effects of botulinum toxin wear off. The nerves take about 120 days before it regenerates, explaining why people sometimes get serial treatments.