Caphasol is a calcium-phosphate rinse. I have not heard of anyone using it much, would be interested in feed-back. Is it prescription or over-the-counter (OTC)?
I found a good web site with a summary of oral agents for patients receiving cancer therapy:
http://www.contemporaryoralhygieneonline.com/content/COH/2006/07/img/preventive.pdf It contains the old standbys such as salt/soda rinse (and recipes) and also a description of available OTC products for dry mouth and mouh sores.
One product missing is Difflam mouth rinse, which is available OTC in UK and many other countries (in Canada as Tantum, a prescription drug still I think). This actually does help control mucositis as shown in double-blind clinical trials but is not yet approved in USA. However Can, UK, Aus, & New Zealand oral cancer patients should use this to reduce severity and duration of mouth sores due to radiation.
Gail