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This collection outlines prevalence, risk factors and the oral health-related quality of life of a number of oral health conditions from around the world. Included studies relate to caries, periodontitis, tooth loss, tooth wear, dental trauma and MIH, which aim to correlate oral health disorders with other health conditions. This offers the chance to assess and compare the various factors which lead to oral disease in different socio-economic systems, highlighting global inequalities in the burden of oral disease and access to dental healthcare.