Hi, Sid
Welcome to the OCF forum - I hope that will will be able to support you while you support your father.

I am not familiar with your father's cancer, but it is included on the NCCN Guidelines posted on this site: http://oralcancerfoundation.org/treatment/guidelines.htm

I would suggest printing the applicable pages for your trip to the doctors.

The standard of care for this cancer is pretty intense - surgery followed by radiotherary or chemo and radiotherapy. Both will inpact eating and talking for a time. I have found references to brachytherapy, but this seems to be in addition to external beam radiation. I am hoping that someone more knowledgable comes along to reply to you - but wanted to send my best wishes to you as you and your father start the journey towards healing.
Maria