Gingival enlargement is most commonly found in which anatomical location?

Gingival enlargement (hyperplasia or hypertrophy) most commonly begins at and involves the INTERDENTAL PAPILLAE and the FREE GINGIVAL MARGIN. This is because: plaque accumulates preferentially at interdental areas; drug-induced gingival enlargement (phenytoin, cyclosporine, calcium channel blockers) classically starts interdentally and extends coronally; inflammatory enlargement follows the same distribution. In severe cases, enlargement may extend to involve the attached gingiva and approach the mucogingival junction, but the initial and most common location is the interdental papilla and free gingival margin.