Botox works by blocking nerve signals in the muscles where it is injected. When those nerve signals are interrupted, the affected muscle is temporarily paralyzed or frozen. Without movement of these selected muscles in the face, certain wrinkles may be softened, reduced, or even removed. 

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Botox only works on wrinkles that are caused by muscle movement. These are known as dynamic wrinkles, and are often called “expression lines.”

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Botox is not a permanent treatment. Repeated treatments are necessary for continued wrinkle-reducing effects. Most people find that the muscle-relaxing effect of Botox lasts for 3 to 4 months.