A patient who is a chronic mouth breather presents with generalized anterior gingival enlargement. What is the primary etiological factor for this presentation?

Correct answer: C. Chronic mouth breathing causing gingival desiccation and inflammation

• A. Acetaminophen is not associated with gingival enlargement. Drug-induced gingival hyperplasia is caused by calcium channel blockers (nifedipine), phenytoin, and cyclosporine.
• B. GERD is associated with dental erosion of palatal surfaces, not specifically with gingival enlargement.
• C. CORRECT. Mouth breathing causes the anterior gingiva to dry out (desiccation), which disrupts the protective effect of saliva and increases susceptibility to plaque-induced inflammation. The resulting chronic localized gingivitis manifests as anterior gingival enlargement, particularly in the maxillary anterior region.
• D. Vitamin C deficiency (scurvy) causes hemorrhagic, swollen, and friable gingiva — but the etiological link here is mouth breathing, not nutritional deficiency.