Ultherapy specifically targets sagging and loose skin mainly in the neck and jowl area. If you are looking to increase volume in your cheeks, you can look into the volumizer Sculptra or dermal fillers like Juvederm or Restylane. These are very effective in plumping the cheeks and filling out hollowed areas.
Ultherapy is a lifting device, not a plumping device. However lifting in the upper face can give the appearance of fuller cheeks by changing facial shape in a subtle way. Consult with your doctor about adding a long lasting filler to your Ultherapy treatment. We call this our "2-D Lift."