1. Petersen PE, Lennon MA (2004) Effective use of fluorides for the prevention of dental caries in the 21st century: the WHO approach. Community Dent Oral Epidemiol 32(5):319–321
2. Beltran-Aguilar ED, Barker LK, Canto MT, Dye BA, Gooch BF, Griffin SO, Hyman J, Jaramillo F, Kingman A, Nowjack-Raymer R, Selwitz RH, Wu T (2005) Surveillance for dental caries, dental sealants, tooth retention, edentulism, and enamel fluorosis—United States, 1988-1994 and 1999-2002. Morbidity and mortality weekly report Surveillance summaries (Washington, DC : 2002) 54(3):1–43
3. Huang R, Li M, Gregory RL (2011) Bacterial interactions in dental biofilm. Virulence 2(5):435–444. https://doi.org/10.4161/viru.2.5.16140
4. World Health Organization WHO global report on trends in tobacco smoking 2000-2025. http://www.who.int/tobacco/publications/surveillance/reportontrendstobaccosmoking/en/.
5. Jamal A, Homa DM, O'Connor E, Babb SD, Caraballo RS, Singh T, Hu SS, King BA (2015) Current cigarette smoking among adults-United States, 2005-2014. MMWR Morbidity and mortality weekly report 64 (44):1233-1240. \doi:https://doi.org/10.15585/mmwr.mm6444a2