Don't bother. What makes a jawline good is a good jawbone (aka mandible), and jawbone is all genetics. Doing this might help make your jaw look a little better, but in the end it is still all about the jawbone.
Edit: Op's theory would work, but it just wouldn't improve appearance by much.
thanks brah, yeah you wouldn't expect it to do an astounding amount
hypertrophic potential of muscles in the jaw is going to be much less than that of a muscle like the bicep
But its definitely possible. We have all seen jaw transformations in before and after pics. Part of it is bf% decrease but theres also muscle increase. Tech will grow a jaw without working it so im sure working it hard would cause growth
Fuarkkkk, it actually works misc. Just started a couple days ago and results are already coming through.
No thanks Jeff Crew
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Or you can just grind your teeth all day worked for me.
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Increasing the masseter doesn't even look good much of the time, or it offers are very arguable improvement (especially in attractiveness to women, ask them). Having a great jaw is all about your actual jaw and chin shape, as well as having low body fat.
BTW Ultra-masculine faces aren't rated as having the highest level of attractiveness by women. You have to judge for yourself and balance out your features. If you already have a large forehead and other masculine traits, you might wanna soften yourself or pull your hair down.