Hello @wretired2000
Sorry your husband is having this distressing problem. I know a lot of head and neck cancer patients and I assumed the thick mucous stopped after the immediate radiation side effects wore off. Most of us are left with a dry mouth. Funnily enough, however, since my last surgery when I had implants, I have been experiencing alternatively a dry mouth and at times a thickened saliva. It's horrible. Soda water, sparkling water, ginger beer can help but are not good for the teeth. They sort of cut through the slime. Some moisturizing products like Oral 7 and Biotene can make the thick mucous/saliva a bit thinner.