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How Long Does Botox Take to Work?

Sono
I am 24. My frown lines are very deep especially for my age. I had botox twice. I am not able to frown, however, I have not seen a difference in my frown lines. My dermatologist did not want to give me more than 20 units. Do I just need more Botox or another treatment? I have had the lines Since I was 22.

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