APF stands for:

• A. Acidulated phosphate fluoride, 1.23% solution used for professional use
• B. Acetylphosphate fluoride
• C. Ammonium phosphate fluoride
• D. Aluminum phosphate fluoride

Answer: (A)

APF stands for acidulated phosphate fluoride, a 1.23% fluoride solution used for professional topical applications. The acidified formulation lowers the pH, which enhances fluoride uptake by enamel and promotes remineralization, making it an effective caries preventive agent when applied in the dental office as a gel or foam. It’s potent and widely used in children with higher caries risk, but the acidic nature means it can affect some restorations or sealants, so it’s used with caution if such materials are present. The other terms listed aren’t standard professional fluoride agents, which is why this option is the correct one.