'Bone smashing' is a dangerous and pseudoscientific 'looksmaxxing' technique promoted in some incel-adjacent corners of the internet, in which users hit their facial bones with hammers or other objects in the belief that the resulting micro-fractures will heal into more attractive features. It is medically unsound and causes serious harm. If your teen mentions or jokes about it, take it seriously and start a conversation about where the content is coming from and the body image pressures young men face online.