How did the child's teeth turn black?

After the child's teeth are injured, the pulp blood vessels in the teeth will rupture and bleed, causing tooth pigment to penetrate into the dentin tubules, causing yellowing or blackening of the tooth surface. Or say that the child's teeth even if the minor trauma, and did not show loosening or pain, pulp nerve can not prevent the affected, this is a chronic continuous process, normal will be in the injury after 3 weeks to 2 years slowly show. Show such a situation, it is recommended that parents take the child to the hospital in time for treatment. Normally, the doctor will do a treatment on the discolored tooth, removing the dead nerve and then doing a root canal treatment to prevent further infection of the tooth and infection of the adjacent tooth. Normally, the child will take the child to the hospital, the doctor will carefully examine the child's affected tooth, and then remove the infected dead nerve to prevent further necrosis of the tooth and infection of the adjacent tooth.