Silhouette Soft. Am I better off with fillers?

I am 38 years old and have been advised to have silhouette soft threads by my doctor. She said I'm the perfect candidate. She did not specify how many threads but I think one or two per side. I've been reading a lot into it and most reviews are quite negative. I have some premature jowl sagging which and the begging of marionette lines. Any advice is welcome! Am I better off with fillers? Can you feel the thread after recovery? I heard that you can't open your mouth wide... is that permanent?

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