Welcome to OCF Tony. You will receive warm support here as you continue to recover from a very tough journey. I also refused chemo and had a radical neck dissection plus radiation and I am happy to tell you that I celebrated 7 years cancer free last month. I do live with a very dry mouth (my major salivary glands are history) and sore throat now and then etc, but all is well compared to some.
I guess you have been told how important it is to manage your teeth professionally if your mouth is dry (which may not be the case, all treatments are different). Without the magic of saliva special care is required or decay will take over.
I wish you all the best, love and light from Helen