What is a permanent cure for masseter hypertrophy?

Sounds like you've been doing your research.  The surgical solution for masseter hypertrophy is to cut out a portion of the masseter muscle with or without reduction of any thickened underlying bone.  Yes, there are reports of radiofrequency used to to reduce hypertrophied masseter muscles.  Radio frequency appears to induce coagulation tissue necrosis of the masseter muscle.  If you are interested in radio frequency, you would need to find someone who offers this treatment, which appears to be less invasive.

(This answer is not intended nor implied to be a substitute for medical advice.  It is posted for patients’ general education only.  Always seek the advice of your physician or other qualified healthcare provider for further evaluation of your individual case.)

 

Masseter hypertrophy causing TMJ is not treated the same as prominent jawline problems.  For aesthetic treatments, Botox or similar agents, radiofrequency, or jaw shaving can be done.  When masseter hypertrophy is associated with TMJ, Botox is the best way to go.  RF can reduce the size of the muscle but causing scar contracture which may worsen your TMJ.  Selective nerve resection can be done but usually requires and external incision.  Removing part of the muscle is possible, but you would be need to be committed to jaw physical therapy after.

Best wishes.