Dental caries, periodontal (gum) disease and tooth loss are common problems in OECD countries. Despite improvements, problems in access persist, most commonly among disadvantaged and low income groups. In the United States, over 40%
of low income persons aged 20‐64 years had untreated dental caries in 2005‐08, compared with only 16% of high income persons (NCHS, 2011). In Finland, onequarter of adults with lower education had six or more missing teeth, while
less than 10% of those with higher education had the same amount of tooth loss (Kaikkonen, 2007).