Baby Tooth Turning Grey. If a child bumps his or her primary baby tooth it may turn dark. The most common cause of gray tooth discoloration is trauma to the tooth enamel.
In a baby tooth this is not a concern most of the time. The cause of tooth discoloration is usually due to blood getting into the pulp of the tooth. Pain around that tooth or a non-painful red bump on the gums around that tooth.
Increased blood flow to broken vessels in the tooth leads to the grayish tinge.
In this MomJunction post we tell you about the reasons for the discoloration of teeth in children and how to address it. This is most likely to occur in children under age 8. The blood leaks in through the dental nerves and discolors the pulp of the tooth. Although tooth decay is the usual cause of your kids tooth turning grey there are several other reasons that may lead to discoloration.