Can anti-wrinkle injections cause the brain to stop using a muscle, resulting in a permanent effect?
I’ve had countless doctors say that anti-wrinkle injections to the masseter will eventually become permanent, because the brain stops signalling one to use the treated muscle. If masseter muscles can be permanently affected by the injections, isn’t it likely upper cheek muscles around the eye can also be permanently affected? Why would the brain reprogram muscle use in the jaw and not in other parts of the face?