Periodontal disease is usually framed as an adult problem, but it begins quietly in childhood. This scoping review, conducted under PRISMA-ScR guidelines and registered on the Open Science Framework, gathered the scattered evidence on how common gingival and periodontal conditions are among children and adolescents across Asia. Searches of PubMed, Embase, Scopus and Web of Science captured cross-sectional studies, cohorts and national oral health surveys published from 2010 onward, restricted to individuals 18 years or younger living in Asian countries.

Eighty-four studies from 24 countries were included. Gingivitis was by far the most frequently reported condition, with prevalence estimates spanning an enormous range, from under 10% to 100% depending on the population and the diagnostic method. Periodontitis appeared less often, identified in adolescents in eight studies, with prevalence between 0.7% and 44.5%.

That dramatic spread is itself the most important finding. It reflects not just real population differences but a deeper problem: studies use inconsistent diagnostic criteria, indices and reporting standards, making true comparison nearly impossible. The authors call for methodological harmonization in future work.

For the clinician, the message is preventive and clear. Gingivitis, the reversible precursor, is highly prevalent in this age group, and a subset of adolescents already shows periodontitis. Routine dental visits for school-age children should include a deliberate periodontal assessment, not just caries screening, so that reversible inflammation is caught and treated before it organizes into attachment loss. Periodontal screening, in other words, belongs in pediatric dentistry as a standing item, not an afterthought.