Maintaining a healthy diet and exercise regimen boost your odds of a sag-free chin. And if you're really worried, or know that your DNA makes you double chin-prone, try "working out" your chin and neck through a series of stretches that help firm your face.
Product treatments: The Velform Chin Wrap and supplementary gel, made from vitamin C, antioxidants, and medicinal oils, claim to begin decreasing a double chin by the end of week one. The restrictive wrap is worn daily for 10 minutes in the morning and 20 minutes at night and falls on the lower end of the cost spectrum at $34.95. It also, most likely, does not work.