FIELD : medicine.SUBSTANCE : invention relates to medicine, in particular to therapeutic and prophylactic measures for inflammatory periodontal diseases in young people. For this purpose, clinically significant titers of periodontal pathogens are determined in the dental plaque, gingival fluid and content of the dento-gingival pocket. If their values are higher than the threshold, the treatment is carried out in one step, Lamifaren is used as a biogel, which is applied in an amount of 0.1 ml/cm2.Wherein it is additionally applied to the inflamed area of the gingiva, gingival crevice, dento-gingival pocket, and insulated with individual plastic caps with exposure of 25 minutes. Gingival papilla, dento-gingival pockets are further treated using a diode laser from the vestibular and oral surfaces of the alveolar process in a discontinuous mode with a radiation power of 0.7 W. Wherein in clinically intact periodontium, the radiation time is 7 minutes per area of one jaw, the course of treatment includes 1 procedure. In chronic gingivitis, the radiation time is 7 minutes per area of one jaw, the course of treatment includes 2 procedures with an interval of 6 days. In chronic mild periodontitis, the radiation time is 15 minutes per one jaw, the course of treatment includes 3 procedures with an interval of 4 days.EFFECT : invention provides the increased therapeutic and prophylactic effect due to the simultaneous treatment of all periodontal sextants of the upper and lower jaws and longer remission period.1 cl, 3 ex