I never felt the infection in my jaw either. Never once had pain or swelling. This is how cavitations work. The bone dies, and there is no blood flow, no immune system access. So the body mounts no defence, no puss no increase in body temperature. The bacteria live in a ball of slime, quite protected from the body.
Ultra sound is probably the best way of finding bone anomalies but if you have no access to cavitat an MRI with STIR imaging might be worth a shot. Thermal imaging can work too. But there are other ways of finding cavitations. Often is you push hard on the area it will hurt. If it hurts you probably have a problem. Normally you can push down hard on bone and you just feel pressure, not pain.