If you have discolored teeth, the cause is often staining on the enamel surfaces from foods, beverages, or smoking.
But tooth discoloration may also originate deep within the root of a tooth.
Sometimes this happens to a tooth that had to have earlier root canal treatment because of injury or decay.
In such cases the living pulp tissue and its blood vessels and nerves had to be removed from the root canals, resulting in the death of the dentin layer, which makes up most of the tooth's body. Over time this caused the dentin to darken.
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Fuente: Youtube / St. Raphael's Dental Practice