“Botox Worked, BUT”

I had a huge number 1 between my forehead that even my tip of my nail could hide in the deep crease. Within 3 days of getting botox that took 25 units I had not one wrinkle between my eyebrows. It was great..BUT...1 1/2 half months later when I frown I can now see a sign of a number 11 between my brows. I was expecting to have the great result last at least 3 months.Next time I'll only get for a special occassion.