Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, offering a...

https://list-wiki.win/index.php/What_Does_RF_Do_at_a_Tissue_Level%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, offering a deep lift that tightens skin over 3 to 6 months. Compared to RF that heats at 40 to 45°C mainly in the dermis, Ultherapy goes deeper