I prefer Ulthera for skin tightening over radiofrequency (Thermage) because the energy can more precisely be targeted to the layer where it is most beneficial for tightening and lifting. The targeted ultrasound energy encourages your body to make collagen. The younger you are, the better your body is at producing collagen. For older individulals, a second treatment may be beneficial. The earliest I recommend doing so is 6 months. Ultherapy encourages your body to produce collagen which you bank. You will look better in two years, than if you would if you did not have ultherapy. For most of our patients, they will reconsider repeating the treatment after 2 years.
Web reference: http://www.lyosmd.com/skin-care_ultherapy.html