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

https://shed-wiki.win/index.php/Laser_Resurfacing_vs_RF_Microneedling_for_Skin_Texture_in_Singapore

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, promoting gradual lifting over 3 to 6 months. Compared to RF, which heats skin at 40 to 45°C mainly for surface tightening, Ultherapy goes deeper for longer-lasting results