Baby gums black and purple more reasons, may consider with dental caries, heavy metal coloring, hematoma and so on. 1. Dental caries: If the baby caries occurs in the neck of the teeth, the teeth and gums may appear black and purple in the process of continuous destruction of teeth. When the primary disease caries is treated, the gum color will gradually return to normal. 2. Heavy metal staining: If the presence of heavy metal deposits is considered, the gums may appear black and purple, and need to be evaluated by an oral surgeon to determine whether to perform laser treatment. Other systemic diseases should also be treated promptly. 3. Hematoma: If the baby is in the budding stage, a hematoma may appear when the tooth has not yet broken through the gums, which is reflected in the blackness of the gums, and usually does not require special treatment, and will be absorbed by the hematoma after the tooth eruption. If your baby’s gums are black and purple, we recommend that you seek further medical attention to determine the cause of the problem.