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

https://fernandosnicethoughtss.scriblorax.com/posts/thread-lift-migration-how-common-is-it-and-what-does-it-look-like

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, which few treatments reach, offering a natural lift that improves over 3 to 6 months. RF heats skin to 40-45°C to boost collagen but doesn’t penetrate as deep