Dental Public Health, Prevention and Community Dentistry
What the exam tests
This domain tests epidemiology, prevention at population level, oral health promotion and the organization of community services. The exam expects you to interpret caries indices and design programs with measurable outcomes.
Core rules and concepts
- Indices: DMFT/dmft counts decayed, missing and filled teeth; it measures lifetime experience but not lesion activity or severity. ICDAS records caries stage and activity. Use the index that matches the program's question.
- Prevention: community water fluoridation, fluoride toothpaste, fluoride varnish, fissure sealants and sugar reduction are core measures. Sealants are most cost-effective on high-risk first permanent molars.
- Health promotion: the Ottawa Charter framework emphasizes healthy public policy, supportive environments, community action, personal skills and reorientation of services. Programs should address the social determinants of health, not only individual behavior.
- Inequalities: access barriers, deprivation and culture affect oral health; targeted programs are more effective than universal messaging alone.
- Evaluation: define baseline, outcome and comparison groups before starting; avoid comparing crude rates across different age structures.
Worked example
A school proposes a sealant program for 7-year-olds in a high-caries community. Reasoning: measure baseline caries and sealant coverage, target first permanent molars, train operators and record retention at 12 months. Compare with a similar school without the program rather than with national averages.
Traps
Using DMFT to compare populations with different age structures; claiming sealants prevent caries without retention data; ignoring fluoride exposure from multiple sources; evaluating a program only by attendance; confusing health education with health promotion.