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

https://scarlettssuperbnews.inkharbory.com/posts/what-is-the-safest-way-to-compare-clinics-offering-ultherapy-in-singapore

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, helping lift and tighten deeper tissues. In contrast, RF heats skin to about 40-45°C mainly affecting surface collagen