Mouth Neoplasms/classification; Mouth Neoplasms/pathology; Mouth Neoplasms/therapy; Analgesia; Brachytherapy; Carcinogens/classification; Dentistry; Drug Therapy; Drug Therapy/classification; Genes, Tumor Suppressor/physiology; Mouth Neoplasms; Mouth Neoplasms/complications; Mouth Neoplasms/diagnosis; Mouth Neoplasms/drug therapy; Mouth Neoplasms/epidemiology; Mouth Neoplasms/genetics; Mouth Neoplasms/immunology; Mouth Neoplasms/physiopathology; Mouth Neoplasms/prevention & control; Mouth Neoplasms/radiotherapy; Mouth Neoplasms/rehabilitation; Mouth Neoplasms/surgery; Head and Neck Neoplasms/therapy; Oncogenes/physiology; Osseointegration; Osseointegration/radiation effects; Osteoradionecrosis/etiology; Hyperbaric Oxygenation/methods; Prognosis; Chemoprevention/methods; Radiotherapy; Plastic Surgery Procedures; Retinoids/chemistry; Retinoids/pharmacology