What are the causes of gingival discoloration?

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Last updated: October 2, 2026 • View editorial policy

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Causes of Discoloured Gums

Gingival discoloration arises from both endogenous (internal) and exogenous (external) sources, with the most common causes being physiological melanin pigmentation, dental materials (amalgam tattoo, metal-ceramic restorations), medications, systemic diseases, trauma-related changes, and cultural practices.

Endogenous (Internal) Causes

Physiological Melanin Pigmentation

  • Most common natural cause of gingival pigmentation across all ethnic groups 1, 2
  • Melanin (brown pigment) varies with cutaneous pigmentation and affects individuals from all races—not limited to darker-skinned populations
  • Distribution: Iranian, Indian, Italian, Arabian, Greek, German, French, Japanese, Chinese, Jewish, Thai, Malaysian, and other ethnic groups display clinical gingival pigmentation 2
  • Typically bilateral and symmetrical in appearance
  • Not pathological but may be aesthetically concerning, especially with high smile lines

Trauma-Related Discoloration

  • Pulpal necrosis following dental trauma causes teeth and adjacent gingiva to appear gray 3
  • Look for: history of dental injury, presence of gingival abscess (parulis) near affected tooth root
  • Common in primary dentition injuries in children aged 2-3 years

Systemic Disease-Related Changes

Chronic Kidney Disease (CKD)/Dialysis Patients 4:

  • Gingival bleeding due to platelet dysfunction and anticoagulant use (heparin)
  • Gingival enlargement from calcium channel blockers or cyclosporine (post-transplant)
  • Brown discoloration in children with renal disorders
  • Increased dental calculus formation from elevated salivary calcium-phosphorus

Drug-Induced Discoloration

  • Medications can cause reversible gingival and tooth discoloration 5
  • Calcium channel blockers and cyclosporine specifically cause gingival enlargement with color changes 4

Exogenous (External) Causes

Dental Material-Related

Amalgam Tattoo 6:

  • Gray or black discoloration from dental amalgam particles embedded in soft tissue
  • Most common locations: gingiva and alveolar ridge
  • Appears as focal, well-demarcated area
  • Permanent unless surgically removed

Metal-Ceramic Restorations 7:

  • Grayish discoloration of gingiva adjacent to metal-containing crowns/bridges
  • Caused by metal ion deposition in gingival tissue
  • Histopathology shows foreign body reaction with higher metal content in discolored tissue
  • Treatment requires: excision of affected gingiva and replacement of metal-containing restorations

Gray MTA (Mineral Trioxide Aggregate) 8:

  • Used to seal root perforations during endodontic treatment
  • Can cause marginal gingival discoloration in aesthetic zones
  • Solution: Replace gray MTA with white MTA formulation

Cultural Practices

Gingival Tattooing 9:

  • Traditional practice in certain West African ethnic groups (Fulani, Mandinka, Soninke)
  • Produces diffuse pigmentation of maxillary vestibular gingiva extending to premolar areas
  • Color ranges from intense blue-gray to light gray or grayish-pink depending on time since procedure
  • Biopsy shows dense fibrous tissue with foreign material aggregates
  • Critical pitfall: May be misdiagnosed as racial pigmentation outside Africa—always obtain patient history

Diagnostic Approach

Key History Elements

  • Timing of discoloration onset
  • Dental trauma history (especially in children)
  • Medication use (calcium channel blockers, cyclosporine, chemotherapy)
  • Systemic diseases (kidney disease, requiring dialysis)
  • Recent dental procedures (amalgam fillings, root canal treatment, crown placement)
  • Cultural background and traditional practices
  • Dialysis status and anticoagulation

Physical Examination Specifics

  • Distribution pattern: Focal vs. diffuse, unilateral vs. bilateral
  • Color: Gray (amalgam, MTA, pulpal necrosis), brown/black (melanin, tattoo), blue-gray (tattoo)
  • Location: Adjacent to dental restorations, near traumatized teeth, maxillary anterior gingiva
  • Associated findings: gingival enlargement, bleeding, parulis formation, tooth discoloration

When to Biopsy

  • Uncertain diagnosis after history and examination
  • Exclude malignancy or systemic disease
  • Differentiate between endogenous and exogenous causes 6, 9
  • Histopathology with foreign body analysis when exogenous material suspected

Ancillary Testing

  • Atomic Absorption Spectrophotometry (AAS): Identifies specific metals in gingival tissue 7
  • Radiographs: Detect radiopaque amalgam particles, assess for dental trauma sequelae
  • Blood tests in dialysis patients: Evaluate coagulation status if bleeding present 4

Common Diagnostic Pitfalls

  1. Assuming all gingival pigmentation is racial/physiological without obtaining detailed history—miss cultural tattooing or systemic causes
  2. Overlooking medication-induced changes in patients on calcium channel blockers or immunosuppressants
  3. Failing to correlate gray discoloration with adjacent dental work—miss amalgam tattoo or MTA leakage
  4. Not recognizing pulpal necrosis as cause of localized gingival discoloration in trauma patients 3
  5. Dismissing aesthetic concerns in patients with physiological pigmentation—address psychological impact when high smile line present 2

References

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.