Amber, glad you got good news on the dental front. Free service is wonderful. Just for your information, simulation is when the doctors will fit your dad with the mask they use to direct the radiation treatments. It is critical that the head and neck are kept completely motionless and the same reference point is used each time the rad is given. Therefore, a mask is made that goes on his face for each treatment to hold him in place. My rad treatments started within a few days of the simulation, so it is good news to get the process started. You can't be done until you start. God bless.