Hi
I tried the Mugard it was given at my hospital. To be honest I didn't get on with it and thinks it caused an allergic reaction but it's worth giving it a try. I just rinsed with bicard and water and salt, that helped and I also gargled with Manuka honey not that often but it did help me with the sores and I found that my mouth healed really quickly.
Hope radiotherapy is going ok we are all here to support you through this even me far away in the uk!
Hugs
Jayne x