ORN is when the jawbone dies. It can break apart and actually shatter in places. Shards can protrude from the gums and can be extremely painful. If untreated, the jawbone will only get worse and more painful. You are doing the right thing by getting checked out right away. Im hoping you do not have ORN! But if it is you are on the right path to getting it taken care of.
Keep us posted. Best wishes!!!
Here is info from the main OCF pages to learn more about ORN....
ORN info