Identify three major risk factors for dental caries development.

• A. Regular brushing, flossing, and fluoride toothpaste.
• B. Adequate fluoride intake.
• C. Smoking, viral infection, and trauma to teeth.
• D. Frequent sugar exposure, reduced saliva flow or buffering, and insufficient fluoride or poor oral hygiene.

Answer: (D)

Dental caries develop when there’s a mismatch between acid production by bacteria and the mouth’s ability to buffer and remineralize. The best choice highlights three major risk factors that work together: frequent exposure to fermentable sugars provides a steady substrate for acid production by plaque bacteria; reduced saliva flow or buffering capacity allows acids to linger and lowers remineralization potential; and insufficient fluoride exposure or poor oral hygiene weakens protective defenses, making enamel more susceptible to demineralization. Protective factors like regular brushing, flossing, and fluoride toothpaste, or adequate fluoride intake, help prevent caries rather than promote it. Factors such as smoking, viral infection, or trauma aren’t primary drivers of caries risk in the same way, so they don’t capture the core causes of caries development.