1. Levine R S, Stillman-Lowe C R. The scientific basis of oral health education. London: BDJ Books, 2004.
2. Anderson R, Treasure E T, Sprod A S . Oral health promotion practice: a survey of dental professionals in Wales. Int. J Health Promotion Educ 2002; 40: 9–14.
3. Audit Commission. Dentistry. Primary dental care services in England and Wales. London: Audit Commission, 2002.
4. Pitts N, Harker R . Obvious decay experience. In Children's dental health in the United Kingdom 2003. pp 9. London: Office for National Statistics, 2004.
5. Strauss A, Corbin J . Basics of qualitative research: grounded theory procedures and techniques. Newbury Park: Sage, 1990.