Radiotherapy and Its Consequences in Relation to Oral Squamous Cell Carcinoma—A Narrative Review

Oral squamous cell carcinoma (SCC) is typically found in middle-aged or elderly individuals, is more common in men than women, can occur at any mucosal site, and is associated with a poor prognosis. The primary risk factors for oral SCC include the use of tobacco, betel nut, or areca nut, and excessive alcohol consumption. A comprehensive management plan for oral SCC typically involves a multidisciplinary team approach with surgery being the primary treatment approach, with or without radiotherapy. Radiotherapy is an essential component in the management of oral SCC, with its application guided by both tumour- and patient-related factors. It may be employed as a definitive, adjuvant, or palliative modality, depending on tumour stage, resectability, surgical margins, histopathological characteristics, as well as the patient’s overall health, financial considerations, and personal preferences. Effective radiotherapy for oral SCC inevitably leads to various tissue toxicities, which can vary among patients. These variations are primarily influenced by patient-specific characteristics, tumour-specific factors, and aspects related to the radiotherapy itself. Some of the complications resulting from ionizing radiation (IR) include oral mucositis, facial dermatitis, salivary gland dysfunction, trismus, and osteoradionecrosis, along with their management strategies.