Ultherapy uses focused ultrasound targeting the deeper 4.5 mm SMAS layer to...

https://highstylife.com/thermage-vs-10therma-are-they-both-monopolar-rf/

Ultherapy uses focused ultrasound targeting the deeper 4.5 mm SMAS layer to stimulate collagen over 3 to 6 months, offering gradual lifting without downtime