The primary objective is to quantitatively synthesize the results of various studies assessing the effectiveness of oral health promotion interventions in schools.

Borenstein, M., Hedges, L.V., Higgins, J.P. and Rothstein, H.R., 2010. A basic introduction to fixed‐effect and random‐effects models for meta‐analysis. Research synthesis methods, 1(2), pp.97-111.