Minniea, mouth sore can last very long after radiation depending on the dose you received. With a very dose of radiation and concurrent chemo, there were plenty of ulcers in my mouth which made eating and drinking water painful. The ulcers would gradually disappear without your noticing but you will feel eating and drinking becoming more tolerable. I am almost two years post treatment and there are still minor ulcers on my tongue which give me a burning feeling if I eat spicy food. I have said goodbye to pepper, curry and chilli for a long time already. This doesn't bother me because I still have a long list of food I can eat. So be patient, mouth sore is very normal and will take time to go.

Karen stage 4 tonsil cancer diagnosed in 9/01.