Question:
What type of injectable filler is the longest lasting for filling out the wrinkles in the forehead? What, if any, complications are associated with injections of this particular filler?

Answer: 
I would use Botox for forehead lines. These lines are due to activity of the forehead muscles and would benefit from relaxing them. The forehead lift tends to be thicker than other parts of the face and will not work as well.