Sdkshif
says''Let me explain that ultrasound waves cannot traverse the bone. That means ultrasound has zero penetration in the bone. Infact, ultrasound waves are reflected away from the bone. So there is no fear in applying the ultrasound on face.''

The study was done for different purpose but that study proves that US penetrates the human temporal bone, that’s means that us even in small portion get to brain tissue that is very us sensitive and substantial for proliferation. My point was don’t use methods for what you are not sure what is the greater benefit (cause there is not enough study to support beneficial effect on nerve recovery) or risk factor (cause US may reach to brain tissue). Always ask your self what you try to accomplish.