Hank, I had this issue for about a year after treatment. Mine eventually went away. I was riding a motorcycle in those days and where the helmet's chin strap cut under my chin used to leave a groove that took hours to go away. I too had the airway issues at night but sleeping on my side helped.

2006 SCC T0 N1 M0; 2006 EBRT x 33, chemo x 3; 2010 Extraction 2 molars; 2010 HBOx30; 2011 Dx osteosarcoma of mandible; 12/20/11 mandibulectomy with temp. titanium plate; 1/31/2012 chemo x 4; 9/19/2012 Reconstruction of mandible with graft from hip and bone morphogenic protein