Ulthera® laser or Ultherapy® is the current gold standard treatment for non surgical lifting of the skin/fat/muscle (all soft tissue) of the face (especially the cheeks) and neck.
OK, firstly to achieve jawline definition we need to see the problem to give you the best advice possible. At your age of 23 Ultherapy will do very little, because your skin laxity is NOT an issue. Devices like Termitight, or even Themage will not be suitable.
Definition is best achieved via fillers, Botox, and in some cases fat removal. Treatments are individualised according to your jaw structure and facial shape. Ultherapy is not an answer for you at this stage.
All the best
Dr Davin Lim
Laser and aesthetics
Fiori Institute of Body Contouring
Thank you for your question! Individuals with a "square" jaw often have hypertrophic masseter muscles. The masseters are the muscles that facilitate in chewing, and can become enlarged or hypertrophic in certain people. What can help to slim down this area and create a "v-shaped" face is injecting Botox into the masseters to help make the muscle less bulky. 12-20 units of Botox on either side is a good starting point.
However, it is difficult to tell without evaluating you in person what would be the best treatment for your specific concerns. If considering Ultherapy, ThermiRF, Botox or any other procedure, I recommend scheduling a consultation with a practitioner familiar with all these treatments so they can help you determine what treatment is best for you.
I hope this answer is helpful! Best of luck.
There are many options for treatment to this area. I suggest a combination approach with fillers, liposuction, and/or kybella. Please see an expert for a consultation. Best, Dr. Emer.