Gum blackening first clear cause to take the appropriate treatment means: 1, melanin deposition: the patient’s gums are only black and no pain, swelling and other symptoms, this situation can not be dealt with; 2, lead poisoning: need to pay attention to, will form a lead line on the gums, check the blood to confirm the diagnosis is indeed elevated blood lead concentration, need to be referred to internal medicine, doctors guide the medication, and lead treatment; 3, malignant melanoma: do After the diagnosis of the disease requires surgical removal treatment; 4, due to the original porcelain teeth caused by the gum black: usually recommend that patients remove the porcelain dental restorations, redo the precious metal porcelain crowns or all-porcelain restorations, usually on the gum black will have a significant improvement; 5, due to subgingival calculus caused by the gum black: after periodontal basic treatment gums will restore the original pink color.