I have received 11 tomotherapy radiation treatments and 3 herbatux (generic) or cytuxamab (brand) chemical theraphies. The reason I am writing this message is to tell you about Caphosol (Artificial Saliva). When you receive radiation in the head and neck area, one of the affects is dry mouth due to loss of saliva. So you lose pH balance in your mouth. When this happens canker sores crop up in your mouth. Some people call this thrush. Whatever, I am here to tell you Caphosol works wonderfully. The only drawback is my insurance Healthsmart doesn't cover this prescription. It costs $167 for a weeks supply. It is worth it though. Its the difference between eating, drinking, swallowing and not being able to do so. Good luck.