I can get cracks in both sides of my jaw…all I do is push on the side of my jawbone and it cracks just like a knuckle, quite loudly actually. The left side cracks the loudest by far but the right side sometimes pops 2 or three times. This is by far my favorite thing on my body to crack.
It is definetely synovial cavitation and not grinding because I can only get it to crack about every half hour or so.