Which of the following is NOT listed as a predisposing factor for periodontal disease?

• A. Plaque
• B. Salivary immune factors
• C. Hypersensitivity
• D. Genetic predisposition

Answer: (D)

Predisposing factors are conditions that make periodontal disease more likely or severe by influencing how plaque develops or how the body's defenses respond. Plaque is the primary causative agent, so it clearly fits as a factor that predisposes to disease. Salivary immune factors shape the local immune defense in the mouth; variations here can tilt the balance toward more susceptibility, making these factors predisposing. Hypersensitivity represents an exaggerated immune reaction to bacterial plaque, which can amplify tissue damage and thus acts as a predisposing host factor. Genetic predisposition, while it affects individual susceptibility, is not typically listed as a predisposing factor in standard classifications used for this topic, so it is the one not listed.