Which statement best describes epidemiology?

• A. It studies causes, distribution, and control of disease in populations.
• B. It studies cell pathology in individuals.
• C. It studies dental arch alignment.
• D. It studies world population growth.

Answer: (A)

Epidemiology focuses on how diseases occur and spread in groups, and on using that information to prevent health problems. It looks at causes, distribution by who is affected, where, and when, and it uses these patterns to guide public health actions. The statement that best fits this idea describes epidemiology as the study of causes, distribution, and control of disease in populations. It isn’t about cellular changes in an individual—that’s pathology at the cellular level—nor about arranging teeth, which is orthodontics, nor about world population growth, which is demography. In dental public health, epidemiology helps us measure how common a disease is in a community, identify associated risk factors, and evaluate how well preventive measures work, such as fluoride programs or sealants.