Will at-home physiotherapy ultrasound tools improve sagging skin on face?

I am 45 year old with sagging skin. my concerns are nasolabial folds and sagging skin. I would like to see some improvement like say 20-25% in the sagginess. While i find ultherapy out of my budget, does at home ultrasound devices/tool which is used in pain relief (physiotherapy) work on face too ? whats the risk in using ultrasound devices on face ?