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Have your child brush their teeth with a soft toothbrush after each meal and before bed.
Rinse the mouth with water after brushing. Do not use mouthwashes that contain alcohol. Alcohol dries out the mouth.
Some chemotherapy medicines and radiation therapy to the head and neck can cause mouth sores. The inside of the mouth may be red or may have sores that can be painful. You may also see white plaques (small raised areas) in the mouth that may be from a fungal infection.
Radiation therapy to the head or neck area can reduce the flow of saliva and cause a dry mouth, making it harder to chew and swallow foods. Dry mouth can also change the way foods taste.