Your doctor can prescribe mouthwashes to reduce the soreness. Dry mouth or throat If the upper part of your neck is being treated your mouth may become dry. This is caused by damage to the salivary glands due to the radiotherapy. There are treatments which can help and it is useful to speak to a dietician who can advise on moist foods that are easy to eat. Artifical saliva is available to relieve dryness and KY jelly can be used to moisturise the lining of the mouth.
Medicated pastilles can stimulate saliva production and some medications can also help.
Your doctor can prescribe these for you. Most people find that the salivary glands gradually recover, but for some people it can be a permanent change. The lining of the throat may become dry and this may continue for a long time after the treatment has finished. You may notice a feeling of sticky mucus in the throat, which will gradually clear up. Your voice may already be hoarse before you start the treatment.