I want to know the duration of double chin lifting for double chin correction.

It’s not that I’ve gained weight, but as I get older, the skin under my chin keeps sagging, making my jawline look dull. My chin folds into two even when I just tilt my head slightly, so I hate taking photos and just sigh every time I look in the mirror. That is why I am seriously considering a double chin lifting procedure, which is said to definitely enhance the jawline.

I'm really confused because there are both ultrasound and thread types. I want to know how long the slimmer look usually lasts after getting a double chin lift done properly. Since I'm spending a lot of money and enduring the pain, it would feel so pointless if I went back to my original state after just two or three months. I know it varies by person based on skin type and the degree of sagging, but I would appreciate advice from those with experience on how long I should generally expect the results to last.