First consider what the averages are for the different areas of the face, so you have a baseline of what to expect starting out. Crows feet on average need 24 units of botox. Request A Consultation Forehead wrinkles, Botox, Face How many botox units for forehead? How many units of botox for forehead wrinkles . Moreover, for the glabella lines, practitioners probably suggest 40 units of botox. 25 to 50 units smile lift (corners of the mouth): Using this amount typically produces results for 3 to 4 months and balances the eyebrows—maybe even lifting them a bit to give you a more wide. Forehead lines, on average, need 20 units of botox. You may not be able to whistle normally or blow your bangs off of your forehead because these activities require a strong pursing action. Some practitioners say they inject an average of 10 to 30 units into the forehead. As my background is not in cosmetics, i have observed many women coming to our alamo plastic surgery office request...