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

https://mylesxbqi254.trexgame.net/how-long-does-ultherapy-take-to-show-results-4-to-6-weeks-or-longer

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