Dark and painful gums, consider dental caries, gingivitis, pulpitis and other diseases. 1. Dental caries: black gums and pain is one of the symptoms of dental caries, under the bacteria and other factors, the healthy hard tissue of the tooth is chronically destroyed. The surface of the teeth is blackened, and there are even cavities, which cause damage to the nerve, and then the symptoms of tooth pain will appear. 2. Gingivitis: black gums and pain can be considered gingivitis, gums due to poor oral hygiene, plaque deposited between the gums and teeth, resulting in inflammation. Inflammation of the gums will be swollen, painful, and over time the gums will become black. 3. Pulpitis: black and painful gums also consider pulpitis, pulpitis is an inflammatory lesion that occurs in the pulp of the teeth, teeth will have spontaneous, paroxysmal pain, the gums may be black. When the gums are black and painful, you should go to the stomatology department of the regular hospital in time, and actively treat the teeth to restore health.