In pregnancy gingivitis, the exaggerated response to plaque biofilm is primarily due to an increase in:

• A. Inflammatory mediators
• B. Salivary enzymes
• C. Bacterial diversity
• D. Mucosal thickness

Answer: (A)

Pregnancy gingivitis is driven by hormonal changes that amplify the jaw’s own inflammatory response to dental plaque. The key factor is an increase in inflammatory mediators produced by the gingival tissues in reaction to the plaque biofilm. Prostaglandins (like PGE2) and cytokines (such as IL-1 and TNF-α) rise in the gums during pregnancy, promoting vasodilation, increased blood flow, and recruitment of immune cells. This heightened mediator activity leads to the characteristic red, swollen, and easily bleeding gums seen in pregnancy gingivitis, even when plaque levels are similar to nonpregnant individuals.

Salivary enzymes, while they can influence oral biology in other contexts, do not primarily drive the exaggerated inflammatory response to plaque in pregnancy. Bacterial diversity can change somewhat, but the distinctive feature of pregnancy gingivitis is the host’s amplified inflammatory reaction, not a fundamentally different bacterial profile. Mucosal thickness may change with hormones, but it does not explain why the inflammatory response to plaque becomes exaggerated.