Cancer is one of the most important causes of mortality and morbidity. Diagnosis and management of Cancer has always challenged the medical field. Head and neck malignancies constitute a major part of all the cancers worldwide. Oral carcinoma is one of the most prevalent cancers and a common cause of death. The basic treatment modalities for cancer are surgery, chemotherapy and radiotherapy. The majority of new cases of invasive head and neck cancer need radiotherapy as a primary treatment, as an adjunct to surgery, in combination with chemotherapy, or as palliation. Radiotherapy has a pivotal role to play in treatment of cancers. This Book describes in detail various techniques of radiotherapy for head neck cancer, their mechanism and principles, oral sequelae of radiotherapy and the prevention and management for the same. Keeping in mind this book is targeted for postgraduate students of dentistry, radiology, medicine, surgery and for those hospitals, institutions and clinics where radiotherapy is taught and practiced.