What is a characteristic of endogenous stains?

Endogenous stains are unique because they originate from within the tooth itself. This internal origin is typically due to factors such as genetic conditions, developmental disturbances, or systemic factors like certain medications or health conditions that affect tooth development and enamel formation. Since these stains develop from within, they can often be more challenging to remove than exogenous stains, which are caused by external factors such as food, beverages, or smoking.

Characteristics like visibility on the surface, ease of removal with regular brushing, or being caused by external factors do not apply to endogenous stains. They do not necessarily reflect the same surface visibility as exogenous stains and typically require more specialized dental treatment for effective removal. This understanding is crucial in the field of dental hygiene and coronal polishing, as it influences the approach to treating different types of stains effectively.