Best Procedure for Double Chin?

The best procedure for a double chin might be two procedures. Often a double chin appearance is created by a small chin as well as excessive fatty tissue in the immediate submental area (the area below the chin in the neck). The best treatment is to remove the excess fatty tissue in that area and strengthen the chin line which will give a better neck and jaw profile. If you are over the age of 45, sometimes a necklifting procedure may also be required for excess skin and sagging, but otherwise the other procedures are sufficient. If your chin line matches your lower lip on the side view, then it may be sufficient to just perform fat removal or liposuction just below the chin.

You should consult a board-certified facial plastic surgeon to discuss which surgical options would be best for you. Neck liposuction works well in younger patients with a strong chin. Sometimes a Chin Implant is needed to improve your appearance. And depending on your age, sometimes a formal neck-lift procedure is necessary.
I hope this is helpful, and best regards.