Objectives To assess effectiveness of an oral health education (OHE) programme on oral hygiene knowledge, practices, plaque control and gingival health of 13‐ to 15‐year‐old school children in Bangalore city. Methods Three schools were randomly selected and assigned to experimental I, experimental II and control groups. At baseline, a 20‐item questionnaire was used to assess the oral hygiene knowledge and practices. Clinical examinations (Turesky–Gilmore–Glickman modification of Quigley Hein plaque index; Loe–Silness gingival index) were performed by 2 examiners. OHE was provided by the investigator for experimental groups I (lecture using a PowerPoint presentation) and II (lecture using a PowerPoint presentation with toothbrushing demonstration). Control group did not receive any intervention. Reinforcement was provided for experimental groups at 3 and 6 months. At end of 9 months, questionnaire was administered and clinical examinations were performed. Data were analysed using chi‐square, anova and post hoc Tukey's tests. Results Nine months post‐intervention, there was significant improvement in oral hygiene knowledge and practices in experimental groups. There were significant reductions in mean plaque index and gingival index scores in the experimental groups. The control group did not show any significant improvement. Conclusion Active involvement of school children with reinforcement of OHE can improve oral hygiene knowledge, practices and gingival health and decrease plaque levels.

Context:Early diagnosis of oral cancer is a priority health objective, in which oral health professionals may play a pivotal role. Detection should lead to less damage from cancer therapy and to a better prognosis.Aims:The aim was to estimate and compare the salivary lactate dehydrogenase (LDH) levels in various histological differentiation of oral squamous cell carcinoma (OSCC) patients and normal subjects.Settings and Design:Hospital-based setting, case-control study.Subjects and Methods:A case–control study was undertaken comprising 30 OSCC patients and 30 healthy controls. The OSCC patients were grouped into well-differentiated, moderately differentiated and poorly differentiated OSCC based on their histological tumor differentiation. Unstimulated whole saliva was collected, assayed for LDH levels using a standard kit and measured spectrophotometrically at 340 nm.Statistical Analysis Used:The results obtained were subjected to statistical analysis using Kruskal–Wallis and Mann–Whitney U-tests. Spearman's correlation was used to correlate the histological tumor differentiation with the salivary LDH levels.Results:The mean salivary LDH levels in the control group, well-differentiated OSCC group, moderately differentiated OSCC group, and poorly differentiated OSCC group were 117.33 ± 19.37 IU/L, 355.83 ± 16.73 IU/L, 484.18 ± 25.84 IU/L, and 620.35 ± 18.69 IU/L, respectively. The difference in the mean salivary LDH levels was statistically significant among the various groups (Kruskal–Wallis χ2 = 50.820, P < 0.001). Spearman's correlation showed significant difference between salivary LDH levels and histological differentiation of OSCC (r = −0.689, P < 0.01).Conclusions:The salivary LDH levels were higher in OSCC patients when compared to the healthy controls. The salivary LDH levels were found to be the highest among the poorly differentiated OSCC.