What classification do stains from diet, trauma, or medications fall under?

Stains that result from diet, trauma, or medications are considered intrinsic stains. Intrinsic stains occur within the tooth structure itself, affecting the dentin and enamel. This classification includes discoloration caused by substances that penetrate the tooth material, such as certain medications (e.g., tetracycline), dietary factors (e.g., excessive consumption of pigmented foods or drinks), and trauma which may cause changes in the tooth color due to internal mineral changes.

In contrast, extrinsic stains occur on the surface of the teeth due to factors such as poor oral hygiene, smoking, or beverages that can color the enamel but do not penetrate it deeply. Temporary stains would imply that the discoloration is short-lived and can be easily removed, while permanent stains indicate that the discoloration is more lasting and typically requires more extensive treatment for removal or concealment. Thus, intrinsic stains represent a more profound and lasting effect on the tooth color compared to extrinsic or temporary classifications.