Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, promoting...
https://archeredxm754.timeforchangecounselling.com/ultherapy-vs-thread-lift-which-is-better-for-a-sharper-jawline
Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, promoting gradual tightening over 3 to 6 months. Compared to RF, which heats skin to about 40 to 45°C to boost collagen, Ultherapy reaches deeper layers for lift