Suboptimal exposure to fluoride is associated with increased caries risk.

• A. True
• B. False
• C. Only topical fluoride matters
• D. Only systemic fluoride matters

Answer: (A)

Fluoride protects teeth by helping remineralize early lesions and by inhibiting demineralization, while also reducing acid production by plaque bacteria. When fluoride exposure is not adequate, these protective effects are diminished and the risk of dental caries rises. Both systemic sources (like water fluoridation or supplements) and topical sources (such as toothpaste, mouthrinses, or professional applications) contribute to this protection, so insufficient exposure through either route increases caries risk. The statement is thus correct because it reflects that suboptimal fluoride exposure, in any form, is linked to higher caries risk. Relying on only one route ignores the contribution of the other to enamel resistance.