"Looksmaxxing has drawn criticism because some influencers promote dangerous techniques to change their appearance, including striking or damaging their jawbones and other risky practices."-from the article.

The looksmaxxing guys have a thing they call bonesmashing where they will hit their jaws with hammers or other implements in order to break it a little. This is done so they can reshape it as it heals. This is a repeated process. The jaw is broken and reshaped continually until they look a little more like the cartoonish over exagerated jawline of the chads from those chad memes. No I'm not kidding and no this is not done with any kind of medical supervision.