Botox 3 times in masseter, is it going to be permanent?

Botox is an injection of a neurotropic agent, which paralyzes a muscle. Within 4-6 months, the muscle should return to relatively normal strength. However, there are reports of permanent atrophy after Botox injections.Everyone has a different response and recovery.Consult a Board Certified Plastic Surgeon.

Botox in the masseter will soften it over time after repeated treatment.  If one stops using botox the muscle will more than likely hypertrophy again.

Botox generally lasts 3-4 months. True atrophy of muscle will take repeated injections of significant dose over a few years and even then, generally the muscle begins to regain density and bulk once its reinnervation has resumed upon complete degradation of the Botox protein. I would recommend that you stop the injection for a period of 6 months at which time the muscle bulk and density should return to pre-injection state.