I'm a 52 y/o female with fair skin. I'm overweight (185 lbs at 5'6 1/2 inches tall). I've noticed my face sagging In the past few years, am getting some jowls and a double chin. My aesthetician recommended 4 sessions every 2 weeks of RF skin tightening on my face. Is it safe to do it that often? Would it be safer to do them once a month instead?