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

https://shed-wiki.win/index.php/Why_Does_My_Jawline_Look_Softer_Even_If_My_Skin_Texture_Is_Fine%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, stimulating deeper collagen production with results that peak around 3 to 6 months. Unlike RF, which heats skin to 40-45°C for surface tightening, Ultherapy reaches deeper for lifting