Background: As is known, cancer therapy includes a complex of therapeutic measures: chemotherapy, radiotherapy and radical. The purpose of this study was to review the literature on the main oral tissue complications arising from chemotherapy and radiation therapy in the head and neck region. Methods: In Google Scholar, Medline, Scopus, Web of Sciences, PubMed a systematic review was conducted. Search keywords terms included: Cancer patients, oral tissue lesions, head and neck, chemotherapy, radiation therapy. Conducted a preliminary search and reviewed 134 titles and abstracts in this literary review included 58. Cancer patients in the oral cavity exhibit a variety of oral tissue lesions during and shortly after radiation therapy to the head and neck. Results: Our search showed that cancer patients following chemotherapy and head and neck radiation therapy often experience oral manifestations. Among these lesions, increased susceptibility to dental caries, periodontal disease, oral mucositis, tissue fibrosis, salivary gland dysfunction, o pportunistic infections of the mucous membranes, and neurosensory disorders are often encountered. These manifestations represent a serious problem for patients and require special strategies from treating physicians to mitigate the harmful effects of radiation therapy on vital functions and improve the quality of life of these patients. Complications in the oral cavity, chemotherapy and head and neck radiation therapy creates many social problems and difficulties for cancer patients. Arguments for an interdisciplinary approach to the management of these patients are recommended in many studies. Conclusion: This review will help dental practitioners manage the risks of dental interventions and prevent potential complications in patients with cancer requiring dental care. Prevention, supportive care, and symptom management by health care providers are important for patients with oral problems related to cancer treatment and can help the patient cope with cancer and its complications.