Ultherapy uses focused ultrasound energy to target the deeper 4.5 mm SMAS...

https://threadvistax.com/s/N_V7Q-mZAtf9qZ_ByXiBC

Ultherapy uses focused ultrasound energy to target the deeper 4.5 mm SMAS layer, stimulating collagen over 3 to 6 months for gradual lifting. Compared to RF, which heats skin to 40-45°C mainly in the superficial layers, Ultherapy reaches deeper tissue