How are exogenous stains classified?

Exogenous stains are classified into extrinsic and intrinsic categories based on their origin and how they affect the teeth. Extrinsic stains originate from external sources and are typically found on the surface of the teeth. These stains can be caused by factors such as diet, tobacco use, or poor oral hygiene, where substances adhere to the enamel and can often be removed through professional cleaning or improved oral hygiene practices.

Intrinsic stains, on the other hand, originate from within the tooth structure itself. These stains can result from factors such as genetic conditions, developmental issues, or the use of certain medications during tooth formation, causing permanent discoloration that is embedded within the tooth.

Understanding this classification helps dental professionals determine the appropriate treatment options for stain removal or management, further emphasizing the significance of prevention and proper oral care. In comparison, the other classifications mentioned, such as soft and hard or transitional and permanent, do not address the specific origins and characteristics of exogenous stains as effectively as the extrinsic and intrinsic distinction does.