What Causes Gingival Overgrowth Over Teeth?

Gingival overgrowth—also known as gingival hyperplasia or gingival enlargement—is a clinical condition characterized by excessive growth of gum tissue that extends over the tooth surface. This is not a disease in itself but rather a sign of an underlying issue, and it can affect one localized area or involve the entire gingiva.

The most common causes include chronic inflammatory gingivitis, often due to poor oral hygiene and plaque accumulation. In such cases, the gums become chronically irritated, leading to edematous and fibrotic tissue expansion. Certain systemic conditions—such as leukemia, granulomatous diseases (e.g., sarcoidosis or Crohn’s disease), and hormonal fluctuations during pregnancy or puberty—can also trigger pronounced gingival enlargement.

Additionally, several medications are well-documented inducers of drug-associated gingival overgrowth. These include calcium channel blockers (e.g., nifedipine, amlodipine), anticonvulsants (e.g., phenytoin), and immunosuppressants (e.g., cyclosporine). The mechanism involves altered fibroblast activity and increased collagen synthesis, often exacerbated by pre-existing inflammation.

Clinically, affected patients may notice swollen, bulbous, or rolled gingival margins that partially or fully cover the crown—particularly near the interdental papillae. Symptoms can include bleeding on brushing, difficulty maintaining oral hygiene, food impaction, and aesthetic concerns. In severe cases, functional impairment—such as interference with occlusion or orthodontic treatment—may occur.

Diagnosis requires a thorough medical and dental history, clinical examination, and sometimes biopsy to rule out neoplastic or infiltrative disorders. Management is etiology-driven: improving oral hygiene and professional debridement for inflammatory causes; medication review and possible substitution for drug-induced cases; and referral for hematologic or systemic evaluation when indicated. Surgical intervention—such as gingivectomy or gingivoplasty—may be necessary for persistent, functionally compromising overgrowth after addressing the root cause.