Abstract: The article describes odontogenic maxillary sinusitis that occurs in diseases of the teeth or upper jaw. The main reasons for its occurrence have been given: foreign bodies such as splinters, roots of teeth embedded in the maxillary sinus during their removal, filling material brought into the sinus, dental implants that have migrated to its cavity. Today's methods of treatment of chronic odontogenic maxillary sinusitis are described. A large number of studies have been devoted to the problem of odontogenic sinusitis. However, the treatment and diagnostic tactics of otorhinolaryngologist and dentist at this form of nosological pathology is not determined. The presented data testify to expediency of the correct approach to treatment of patients with chronic odontogenic sinusitis.