1. Fuller E, Steele J, Watt R, Nuttall N. 1: oral health and function—a report from the Adult Dental Health Survey 2009. NHS Digital. 2011 [cited March 2017]. Available from: http://tinyurl.com/k4lx24s .
2. Steele J, Treasure E, Fuller L, Morgan M. 4: complexity and maintenance—a report from the Adult Dental Health Survey 2009. NHS Digital. 2011 [cited March 2017]. Available from: http://tinyurl.com/mcjrlvb .
3. Graves RC, Beck JD, Disney JA, Drake CW. Root caries prevalence in black and white North Carolina adults over age 65. J Public Health Dent. 1992;52:94–101.
4. Hamasha AA, Warren JJ, Hand JS, Levy SM. Coronal and root caries in the older Iowans: 9- to 11-year incidence. Spec Care Dent. 2005;25:106–10.
5. NIH: National Institute of Dental and Craniofacial Research—dry mouth. 2016 [cited February 2017]. Available from: http://tinyurl.com/z8g7wrb .