Which combination contributes to periodontitis?

• A. Bacterial toxins, inflammatory response
• B. 2-3 days
• C. 5mm
• D. Xrays

Answer: (A)

Periodontitis develops when pathogenic bacteria in dental plaque interact with the host’s inflammatory response. Bacterial toxins from these organisms, such as endotoxins and proteolytic enzymes, provoke an inflammatory reaction. When this response becomes chronic, it drives tissue destruction: connective tissue breakdown and alveolar bone loss, leading to attachment loss and pocket formation. This combination of microbial virulence and the host’s inflammatory processes is what advances the disease.

The other options aren’t mechanisms that cause disease. A timeframe like 2-3 days isn’t a causal factor. A 5 mm value is a clinical measurement (pocket depth) rather than something that contributes to disease. X-rays are imaging used to assess severity, not factors that cause periodontitis.