 Patients are required to have a favorable performance status KPS greater than or equal to 70, have had no prior head and neck radiotherapy and be at least 18 years of age and able to provide consent. While receiving radiotherapy and a concurrent systemic regimen, patients will receive LLLT using a 69 diode probe with dual 660 nm and 850 nm wavelengths to at least nine treatment sites in the head and neck region for a duration of 60 seconds to each site. LLLT will be given three times in a week prior to, daily during the first week of, and at least twice weekly thereafter during radiotherapy. 