Ultherapy uses focused ultrasound targeting the 4.5mm SMAS layer, promoting...

https://wiki-tonic.win/index.php/Does_Ultherapy_Hurt_and_What_Affects_Comfort%3F

Ultherapy uses focused ultrasound targeting the 4.5mm SMAS layer, promoting collagen over 3 to 6 months for natural lift and tightening. Compared to RF which heats skin to 40-45°C mainly in the surface layers, Ultherapy reaches deeper tissues