In big city, they will have free clinic, for Physician, dental and eye. You
need to go to the city website to find the information. Also in Chicago, you
have big univeristies. Universities have dental school. They will have
student dentist, usually do dental work only 1/3 of regular price. Also in
student dental clinic, first exam is free. Then they will give you fee
listing for the dental work, and it is up to you to do it or not.
So search for your Dad.