What Causes Black Discoloration of the Lower Gum?

　　In daily life, many patients notice that their gums appear black—a sign that is not normal and thus causes greater concern. This discoloration may result from oral ulcers, melanin deposition, or chronic periodontal disease. Patients should consult a dentist for a thorough examination of their teeth and gums. Treatment may involve medications, along with professional oral cleaning to remove dental plaque and calculus. So, what causes blackening of the lower gums?

　　What Causes Blackening of the Lower Gums?

　　Blackening of the lower gums may be caused by dental calculus (tartar) associated with dental caries, gingivitis, or periapical abscesses. A common cause of gum discoloration is melanin deposition—patients with blackened gums but no pain or swelling typically experience a benign, physiologic condition that poses no threat to health. However, lead poisoning must also be considered: it can produce a characteristic “lead line” (a bluish-black line) along the gingival margin. In such cases, blood tests are required for diagnosis. If elevated blood lead levels are confirmed, medication should be administered under a physician’s guidance, along with chelation therapy to eliminate lead from the body.

　　Once gum discoloration is observed, prompt medical evaluation is essential. A dentist will perform relevant examinations to determine the underlying cause and implement targeted interventions accordingly. When blackening stems from endogenous factors, it often correlates more closely with systemic diseases; therefore, effective management of the underlying systemic condition usually leads to improvement in gum pigmentation. Additionally, smoking can contribute to gum darkening. Patients who quit smoking—or minimize exposure to heavy metals—may see noticeable improvement in gum color.

　　Patients should also maintain rigorous oral hygiene and undergo regular periodontal health check-ups. We hope this information proves helpful to you.