The many types of gingival enlargement can be classified according to aetiologic factors and pathologic changes as follows:

Hereditary gingival enlargement	● Familial gingival enlargements
Inflammatory enlargement	● Chronic   ● Acute
Drug induced enlargement	● Non inflammatory Fibrotic gingival enlargement is a side effect of: Convulsants- Phenytoin Calcium channel blockers- Nifedipine, Nitrendipine Immunosuppressant drugs- Cyclosporine Tacrolimus is another immunosuppressive, which causes very less gingival overgrowth.
Enlargements associated with systemic diseases	A. Conditioned enlargement ● Pregnancy ● Puberty ● Vitamin C deficiency ● Plasma cell gingivitis ● Non specific conditioned enlargement (granuloma pyogenicum) B. Systemic diseases causing gingival enlargement ● Leukaemia ● Granulomatous disease (Wegeners granulomatosis, Sarcoidosis)
Neoplastic enlargement(gingival tumours)	● Benign tumours of the gingiva ● Malignant tumours of the gingiva
False enlargement	● Underlying osseous lesions ● Underlying dental tissues