What condition is NOT typically associated with necrotizing periodontal diseases?

Necrotizing periodontal diseases, which include necrotizing ulcerative gingivitis (NUG) and necrotizing ulcerative periodontitis (NUP), are characterized by a range of symptoms and clinical findings. Healthy gingival appearance is not a feature of these diseases; rather, they are marked by significant tissue destruction and other pathological changes.

In cases of necrotizing periodontal diseases, people usually present with severe pain, a fetid odor due to necrotic tissue, and obvious necrosis of the gingival tissues. The presence of these symptoms indicates a profound pathological condition rather than health. Therefore, the correct answer points to the fact that a healthy gingival appearance is inconsistent with the clinical manifestations found in necrotizing periodontal diseases. Healthy gingiva is typically characterized by normal color, contour, and lack of inflammation, which starkly contrasts with the necrotic tissue and inflammation associated with these conditions.