What type of stain is typically not considered intrinsic?

Intrinsic stains are those that are integrated into the tooth structure itself, often resulting from internal factors, such as medication or systemic conditions. Yellow stains, on the other hand, are generally classified as extrinsic stains. These are deposits that form on the outer surface of the teeth, commonly caused by external factors such as diet, tobacco use, or poor oral hygiene.

Unlike intrinsic stains, which persist in the tooth enamel or dentin and are often more difficult to remove, extrinsic stains like yellow stains can usually be treated with professional cleaning, polishing, or whitening procedures. Therefore, identifying yellow staining as extrinsic reinforces the understanding of how different types of stains interact with the tooth’s structure and respond to treatment methods. In contrast, dental fluorosis, tetracycline stains, and age-related amalgam stains are all categorized as intrinsic due to their deeper integration into the tooth’s composition.