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

https://wiki-club.win/index.php/What_Age_Is_Best_for_RF_Tightening%3F_Exploring_the_30s_to_Early_40s_Sweet_Spot

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