n***a got this from google your the grey
Dude you can use anything, a hammer, massage gun, fists or anything that you can physically use to hit your face that won't break your fucking bones.
An example of Wolff's law is: Kickboxing. They usually have bigger, more dense shins for this exact reason, they constantly get kicked in the legs and kick bags.
You don't need to bs for an hour plus idk where tf you got that shit from but definitely not from someone educated.
Acting as if asymmetry isn't fixable, one reason I'm doing it is because I have asymmetrical mandibles so it'll still help me, the reason it comes out asymmetrical for most people is because they aren't doing it right.