Dentin, the layer of tooth beneath the enamel, can turn black primarily due to tooth decay resulting from plaque and tartar buildup.
Here's a breakdown of the reasons:
- Tooth Decay (Caries):
- Plaque and Tartar: Poor oral hygiene leads to the accumulation of plaque (a sticky film of bacteria) and its hardened form, tartar, on the tooth surface.
- Acid Production: Bacteria in plaque feed on sugars and carbohydrates, producing acids that erode the enamel and then the dentin.
- Discoloration: As dentin decays, it becomes softened and discolored. In advanced stages, this discoloration can manifest as black.
In summary, black discoloration of dentin is a strong indicator of advanced tooth decay, primarily caused by poor oral hygiene leading to plaque and tartar buildup.
