Which of the following describes things that lead to periodontitis?

• A. Calculus
• B. Bacterial toxins, inflammatory response
• C. 2-3 days
• D. Neutrophils

Answer: (B)

Periodontitis results from the interaction between pathogenic dental plaque and the animal’s immune response. Bacteria in plaque release toxins and other inflammatory factors that irritate gingival tissues, and the host’s immune system reacts with inflammatory cells and mediators. This response, including cytokines and enzymes, drives breakdown of the gingival connective tissue, destruction of the periodontal ligament, and resorption of alveolar bone, leading to pocket formation and attachment loss. The term that best describes what leads to periodontitis combines these microbial factors with the host inflammatory reaction. Calculus is a sign that plaque is present and can harbor bacteria, but it’s not the direct cause; the timeframe option is irrelevant; neutrophils are part of the inflammatory response but don’t by themselves explain the disease process.