What Causes a Tooth to Erupt Through the Gums?

Gingival overgrowth—commonly referred to as “gums growing over teeth”—is a clinical condition characterized by abnormal enlargement of the gingival tissue, leading to partial or complete coverage of the tooth crown. This is not a standalone disease but rather a sign of underlying pathology, medication effect, or systemic influence.

The most frequent causes include chronic inflammatory gingivitis, often resulting from poor oral hygiene and prolonged plaque accumulation. In such cases, the gingiva becomes edematous and hyperplastic in response to bacterial biofilm, particularly along the gingival margin and interdental papillae.

Drug-induced gingival overgrowth is another well-documented etiology. Calcium channel blockers (e.g., nifedipine, amlodipine), anticonvulsants (e.g., phenytoin), and immunosuppressants (e.g., cyclosporine) are strongly associated with fibroblast proliferation and excessive collagen deposition in the gingival connective tissue. The severity often correlates with plaque levels—patients with good oral hygiene may exhibit minimal changes despite long-term drug exposure.

Less common but clinically significant contributors include hormonal fluctuations (e.g., during pregnancy or puberty), certain hematologic disorders such as leukemia (where gingival infiltration by malignant cells can cause rapid, asymmetric swelling), and rare genetic conditions like hereditary gingival fibromatosis—a benign, autosomal dominant disorder marked by progressive, noninflammatory gingival enlargement beginning in childhood.

Diagnosis requires thorough clinical evaluation, including periodontal probing, radiographic assessment to rule out bone loss or root anomalies, and, when indicated, biopsy and laboratory testing—especially if systemic disease is suspected. Management is etiology-specific: optimizing oral hygiene and professional debridement for inflammation-driven cases; collaborating with the prescribing physician regarding potential medication alternatives or dose adjustments in drug-induced cases; and referral to hematology or genetics for suspected systemic or inherited causes.

Left untreated, severe gingival overgrowth can compromise oral function—impeding mastication, speech, and effective plaque control—and increase risk for secondary periodontitis, caries, and aesthetic concerns. Early recognition and multidisciplinary intervention are essential for preserving both periodontal health and overall well-being.