Is it possible to build up facial muscles with FACEXER? (Photo)

I am 75 years old, love Botox to my forehead. I tried Thermage to improve my jawline - it didn't help. I bought FACEXER. I've been doing exercises for about 3 months now using method I've found on their website and I am taking monthly photos to document any changes. I would like to hear doctor's opinion about building up muscle volume. It works very well for me.