Ultherapy uses ultrasound energy targeting the 4.5 mm SMAS layer deep in the...

https://qqpipi.com//index.php/Is_Ultherapy_Safe_Around_Nerves_and_Bone_Because_of_Imaging%3F

Ultherapy uses ultrasound energy targeting the 4.5 mm SMAS layer deep in the skin, stimulating collagen over 3 to 6 months for gradual lifting. Compared to RF, which heats skin surface to 40-45°C for tightening, Ultherapy reaches deeper layers