... dental care for the 12 years -old pupils at some secondary schools in Gia Lam, Quoc Oai District, Hanoi City in 2009. 2. Assess the efficiency of dental plaque control in the decay teeth, gingivitis ... Evaluate the DP control efficiency in the DT and gingivitis prevention of the pupils 4.2.1. Evaluate the DP control efficiency in the DT and gingivitis prevention of the pupils 4.2.1.1. Evaluate ... Gingivitis, dental plaque and KAP about ODC for the 12 year -old pupils - Identified the reality of the decay teeth, gingivitis, dental plaque for the pupils - Identified the reality of KAP of the pupils...