Radiation and chemotherapy are the treatment options for head and neck cancer. Several side effects related to those treat-ment have been shown. Oral mucositis is a common side effect in patients undergoing those treatment. The presence of oral mucositis in these patients would influencing quality of life therefore compromising treatment outcome. The spec-trum of oral mucositis can be clinically seen as thinning of oral mucosa, oral discomfort to painful oral lesion causing mastication impairment with increasing risk of infection. The Multinational Association for Supportive Care in Cancer (MASCC)/International Society for Oral Oncology (ISOO) has recommended some means that have important role in the management oral mucositis. The low-level laser therapy (LLLT) is a relatively new way of reducing the severity of oral mucositis, although the true mechanism of action is still under study. This review aimed in exploring update about the usage of LLLT for oral mucositis treatment.