13 months ago
This is a great question. Botox works by paralyzing the underlying muscles, which prevents the formation of wrinkles by preventing the muscle from bunching up the overlying skin. For mild wrinkles at rest and wrinkles that are only visible when you contract your forehead or orbicularis (the muscle causing crow's feet), Botox is very effective.
For deeper wrinkles that are present even at rest, Botox is less effective. This is because over years of the constant stress on the skin which causes the wrinkles, the dermis of the skin atrophies (weakens) and a permanent wrinkle is formed. So, even if the underlying muscle is paralyzed, the skin still has wrinkles from the dermal atrophy.
For these wrinkles, you may need a dermal filler to support the overlying dermis. Alternatively, you may need surgery to "lift" the forehead and lateral temporal (above the crow's feet) area to smooth out the wrinkles.
I hope this is helpful. David Shafer, MD New York City
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