Hi Irene,
This is a consensus of your medical team? Has there been a tumor review board? Has he had a baseline TSH and hearing (audiology) test? PET/CT? These are some questions to ask. Teeth removal can be tricky as well. If you are in doubt or not confident, about any of these issues, ask for a second opinion.
We are also here, with our experience, strength and hope, for you. Things typically move very quickly at this point.
Page ORPH-2 are the current NCCN recommended treatment choices for your general information in the link below:
http://www.nccn.org/professionals/physician_gls/PDF/head-and-neck.pdf