Rapidly progressive periodontitis is a variant of aggressive periodontitis, characterized by manifestation before the age of 35 and rapid loss of bone tissue. The prevalence of aggressive forms of periodontitis varies among different populations and reaches its highest values ​​for the population of the African continent - 4.2%. One of the key microbial factors associated with the development of the disease is Aggregatibacter actinomycetemcomitans, which produces a large amount of leukotoxin that disrupts the migration of leukocytes and inhibits the activity of fibroblasts. Treatment of such patients is associated with many difficulties and, as a rule, has an unfavorable prognosis, however, with timely diagnosis and correctly chosen treatment tactics, it is possible to achieve stabilization of the process. A clinical case of successful management of a patient with a diagnosis of "rapidly progressing periodontitis of severe degree; chronic generalized periodontitis stage III grade B" for 18 years (from 2006 to 2024) is described. The patient sought help at the age of 20, he was given an accurate diagnosis and underwent comprehensive treatment with correction of individual hygiene. For 14 years, the patient did not seek specialized periodontal care and only in 2023 did he return to see a periodontist. At this stage, a comprehensive rehabilitation program was planned and implemented, including conservative, surgical and supportive therapy. Upon completion of the active phase of treatment, stabilization of the process was achieved. The success of treating rapidly progressing periodontitis largely depends on early diagnosis of the disease and an accurate diagnosis. Only compliance with the recommended individual oral hygiene regimens and regular dispensary observation will help maintain the achieved treatment results in the long term.