Black teeth can be a sign of an underlying decay or cavities that should be addressed as soon as possible. However, black teeth may also be the result of staining. Different foods and drinks can leave behind a bit of pigment, causing the teeth to turn black.
Teeth owe their color to the high amount of calcium found in the outer layer of the teeth, known as the enamel.
Over time, additional elements left behind by foods and drinks can start to make teeth yellow or gray. If the teeth turn black, however, a person should visit a dentist as soon as possible.
Teeth turn black from either extrinsic or intrinsic causes.