Can Ultherapy performed on the forehead (brow lift) affect the frontal lobe of the brain in any way?

Ultherapy performed on the forehead for a brow lift would not affect the brain.  The brain is too deep to be affected by the treatment.  

Given that you would even think of this question, I would highly suggest you have a detailed conversation with your treating doctor before deciding to have such a treatment as I suspect there may be more concerns and general anxieties which may not make you a good candidate for an elective cosmetic procedure.

Thank you for your question.  Ultherapy will never penetrate deep enough to affect brain matter.  If it were to penetrate deeper than the skin, the energy generated by the ultrasound would be absorbed by the bone (your skull) before it ever got close to heating your brain tissue.  Regards, Dr. Matt Elias