My jaw area feels flabby.

I have some skin concerns. My face is losing overall elasticity, and my skin feels thinner and sagging. I became interested in Dencerty, a radiofrequency treatment, after reading that it tightens inner skin elasticity. Since my skin is naturally thin and sensitive, I am very afraid that receiving treatments involving heat, such as lasers or radiofrequency, might make my skin even more sensitive or cause redness. I would like to know if there is a proper cooling system in place to minimize irritation and ensure a safe Dencerty procedure. I would also appreciate a consultation on how long the firming effect lasts after treatment and how often I should receive the treatment to see the full results.