I keep commenting... here's an article http://www.livestrong.com/article/156836-facial-muscles-tension-exercises/ I have gotten my face to become sore doing exercises so it may work. I have not been disciplined enough to do them consistently.
The first step would be neural recruitment. So if you already bought one use it for a while and see if you can transition into some kind of "exercise" where you attempt to create resistance with your fingers or what have you. Eccentric contraction will cause the most growth(extending the muscle while it bears tension: ie: the lowering of the dumbbell during a bicep curl). So try to release slowly (3sec).
Electrical stimulators will have the ability to enhance neural recruitment of the muscle it innervates, so you will be more likely to use it. It might be useful if you have a muscle one one side that you don't seem to use in facial expressions causing asymmetry.
On the subject of muscle growth, however, myofibriliar growth is not possible because the muscle actually needs to tear due to high tension. Sarcoplasmic hypertrophy is not likely to occur, but is more likely. I suppose if you had a stimulator that really fatigues the muscle within 45sec -90sec, the muscle may resort to fermentation as a primary source of energy (depleting glycogen stores and PCr/ATP). You would need to treat this like any other sarcoplasmic workout and repeat for 3-4 sets and break about 45-60sec between sets. This will not, if it works, however, cause true muscle growth. It will only cause the cells to fill with extra energy stores and water will follow osmoticly to causing muscular swelling (which appears as muscle growth). The cells will not continue to grow because muscle is not being built.
On the subject of Botox...I am a huge critic of Botox. Botox does everything you don't want to your face. It may reduce wrinkles, but it does it the opposite way it should be done. Muscular tone is far more attractive. Botox metaphorically tells a woman not to workout her abs so her gut doesn't wrinkle, as a result the girl winds up being skinny and fat (one of the most unattractive combinations possible). Obviously since we don't know what activates myosatellite cells (and creating muscle tension on facial muscles is difficult or impossible), achieving facial tone is something that can only be fixed by muscle grafts and skin stretching. I'm not saying not to try, not many people bother with the concept of facial muscle tone because society tells them not to. Hopefully someone figures out a way.
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