Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under...

https://johnathanytzx289.image-perth.org/what-does-operator-dependent-mean-for-ultherapy-results

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer deep under your skin, encouraging natural collagen over 3 to 6 months. Compared to RF, which heats skin to 40-45°C mainly for surface tightening, Ultherapy reaches deeper layers