Intrinsic discoloration refers to a change in the color of a tooth that originates from within the tooth structure itself. This type of discoloration can be caused by various factors, including trauma, certain medications, or dental conditions. Unlike extrinsic discoloration, which affects the outer layer of the tooth, intrinsic discoloration is often more challenging to treat. Common causes of intrinsic discoloration include exposure to tetracycline antibiotics during tooth development, dental trauma that leads to internal bleeding, or conditions like dentinogenesis imperfecta. Treatment options may involve teeth whitening procedures, veneers, or crowns to restore the tooth's appearance.