How often should masseter Botox be redone?

You can usually redose the Botox around every 3-4 months at first.  After a few treatments, you will notice that the masseter muscle will begin to atrophy and your face will look slimmer and the grinding will be less.  You can then increase the time between treatment sessions (maybe 6 months).  I would talk to your doctor about this, after your next treatment.

Botox is a great treatment for the masseter muscles. It should relax this area for up to 4 months. Please consult an expert.  Best, Dr. Green