I know a man whose grandfather is a 105 yr old WWi vet who smokes a pack of lucky strikes every day .This does'nt prove smoking does'nt cause health problems.Many people who get osteonecrosis have genes that code for blood clotting anomolies such as prothrombin(profactor II ) mutation,antithrombinIII mutation etc.
Most people with TMJ have had their wisdom teeth removed so perhaps their jaw pain is from cavitations and not psychological tension as many of us are told by dentists treating us for TMJ including mine who is the dean of a dental school.
Dr Breiner and others will not treat cavitations in asymtomatic people which makes sense in a cost benefit analysis because you can get infected by the surgery.
Dr Breiner says to avoid ice after dental procedures since it impairs circulation making bone death more likely.