1. Leung WS, McMillan AS, Wong MCM. Chronic orofacial pain in Southern Chinese people: experience, associated disability, and help-seeking responses. J Orofac Pain. 2008;22:323–30.
2. McGuire S, Hoogeveen J, Bacchia P, Johnstone P, Khew C, Lee B, Marchant H, Morris K, Riley C, Smith K, Kruger E, Tennant M. The presenting complaints of low income adults for emergency dental care: an analysis of 35,000 episodes in Victoria, Australia. Community Dent Health. 2008;25:143–7.
3. Bastos JL, Gigante DP, Peres KG. Toothache prevalence and associated factors: a population-based study in Southern Brazil. Oral Dis. 2008;14:320–6.
4. Chavers LS, Gilbert GH, Shelton BJ. Racial and socioeconomic disparity in oral disadvantage, a measure of oral health-related quality of life: 24-months incidence. J Public Health Dent. 2002;62(3):140–7.
5. Constante HM, Basto JL, Peres KG, Peres MA. Socio-demographic and behavioural inequalities in the impact of dental pain among adults: a population-based study. Community Dent Oral Epidemiol. 2012. doi:
10.1111/j.1600-0528.2012.00701.x