I am curious about double chin treatment.

I have a question about double chin treatment.
A typical double chin is a phenomenon caused by weight gain, isn't it?
Then it seems like you just need to go on a diet.
Is the existence of a separate double chin procedure unrelated to that?
Or does this mean that a double chin caused by obesity can be improved in addition to a congenital double chin?
I saw an advertisement for a double chin procedure and became a bit curious, so I am leaving a post.
I'm also curious to see if there are any genuine reviews from people who have had a double chin procedure.
What do you all think about double chin procedures?