The prevalence and intensity of parodontium diseases among children of school age and also teenagers of educational institutions of Yakutsk have been studied. Their high level of frequency in these examined groups where mostly chronic catarrhal gingivitis and rarer localised chronic periodontitis of mild case were defined. On the other hand, the unsatisfactory oral cavity hygiene was revealed in these groups of children that accordingly characterized insufficient level of sanitary culture of children and their parents. We’ve chosen preparation "Yagel" for the research. It is made of native vegetative raw materials of frond lichens extract of Cladina family. It has a high maintenance of usnicand other lichen derivative acids in clathrate shape with lichen β ‐ oligosaccharides and possesses the antimicrobial action which hasn’t been studied earlier in clinical dentistry. Taking it into account we’vestudied antibiotic action of "Yagel" to conditional‐ pathogenic microflora incase of gingivitis. The microbiologicassessment of this medication has revealed certain features of minimum inhibiting concentration and minimum bactericidal concentration. So, the use of "Yagel" affected on quantitative and quality indicators of gram‐ positive, gram‐negative microorganisms and also Candidainfection. The revealed inhibiting and bactericidal concentration of "Yagel" allowed to assert that it could promote reverse development of inflammatory process of gum tissues in the clinical plan and accordingly, reduce period of treatment and help treatment‐and‐prophylactic efficacy. In this connection this preparation could be applied in complex gingivitis therapy as alternative medication. Thus "Yagel" is produced in Yakutsk that defines its low cost price and availability for a wide range of the population. There is a necessity of further researches of clinical efficacy of "Yagel" in pathological processes of parodontium tissues of inflammatory‐destructive character.