I am glad you specified that this is a source of relief. Especially if you delve a bit deeper....... imagine how they measured the saliva production in mice??!
Often however, people tend to grasp at straws and drive themselves nuts with all the crap that you find on the net or worse delay standard treatment.
Clearly, loss of normal saliva production and types is a problem. .. but as Brian has pointed out, you have to be around to be able to complain. And that would be a good thing!
Beside chemo protection and stents during radiation there is not much you can do during treatment and this may not be all that relevant anymore give the targeted radiation delivery these days (except perhaps for special cases).

Keep researching!!!

M