My thick, disgusting mucous morphed into foamy mucous about 4 weeks post rad. It varies in amount but builds as the day goes on (I am about 10 weeks post rad now). I m hoping it will one day morph into saliva, as after the thick mucous, the dry mouth is the worst part of treatment so far for me.

The most helpful thing I have found so far is brushing my teeth and mouth (gums, roof of mouth, & tongue + teeth), carefully and gently, using my electric toothbrush. This removes the foam "coating" that builds up, until it build up again. The downside is that brushing the roof of the mouth and back of the tongue gags me, but I can live with that.

Swishing the mouth frequently with fluid seems to slow the buildup. Letting the fluid (water with baking soda, e.g.) sit in the mouth for several minutes, if tolerated, seems to be better for removing the mucous than just swishing for a moment.

DO check with your oncologist or oncological dentist before trying this as it may not be appropriate for your situation or stage of recovery. Good luck, and happy holidays.