Hello Interloper!
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So if you are of average build and normal facial muscles mass, and you are having the frown line and your forehead treated with Botox you should probably be getting a total dosage of around 40-50 units.
This will reliably achieve an effect that is going to last you for the next four months or so.
Clearly if you are exceptionally lean or exceptionally well endowed with facial muscles then the dosage will need to be altered accordingly.