Investigations during and after treatment: Patients will have weekly toxicity assessments during radiotherapy. Follow-up after completion of RT will include history/physical, QOL assessment, and salivary flow collections. These assessments will be done at 4, 8, and 12 weeks, then every 1.5 months until 1 year. Follow-up beyond 1 year is at the physician's discretion but normally will involve visits every 3-4 months.