A Study to Describe the Effect of Photobiomodulation (Low Level Laser Therapy) in Reducing the Severity and Incidence of Oral Mucositis (Oral Ulceration) in Oral Cancer Patients Undergoing Radiation Treatment

Inclusion Criteria: * Patient has provided written informed consent using the PBM PICF * Age ≥ 18 years of age at Screening * Histological diagnosis of HNC of the oral cavity with no evidence of macroscopic or microscopic residual disease post-surgery (R0 or R1 resection) with histopathological confirmation and no gross residual lymphadenopathy in the planned PBM treatment area * Planned treatment with RT or chemoradiotherapy to a dose of ≥ 50 Gy Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1 (Appendix 1) * Intact oral mucosa (no visible ulceration, dehiscence, or active infection) Exclusion Criteria: * Gross macroscopic and/or microscopic residual disease post-surgery (R2 resection) or gross residual lymphadenopathy in the planned PBM treatment area * Prior RT to the head and neck including the oral or oropharyngeal mucosa * Prior cytotoxic chemotherapy in the last 3 months * Diagnosis of photosensitive disorder (cutaneous porphyria, xeroderma pigmentosum, etc) * Concurrent administration of cetuximab * Known to be pregnant or planning to become pregnant within the trial period * Diagnosis of epilepsy