Which section of the tooth is most commonly stained?

The most commonly stained section of the tooth is the cervical third and interproximal areas. This is due to several factors that contribute to the accumulation of plaque and stain in these regions. The cervical third of the tooth is located near the gum line, where bacteria have easy access, often resulting in greater biofilm buildup and susceptibility to discoloration. Additionally, the interproximal areas are prone to retain food particles and plaque because of their proximity to neighboring teeth, making them a common site for staining as well.

Staining in these areas can also be exacerbated by dietary choices, such as consuming colored beverages and foods, which tend to adhere to the rough surfaces of teeth, particularly where brushing may not effectively dislodge debris. Furthermore, these areas are often less accessible during regular oral hygiene routines, meaning they aren't always cleaned as thoroughly compared to other sections of the tooth.

In contrast, the incisal edge and occlusal surface generally receive more direct brushing and may be less likely to accumulate stains, while the root surface is typically covered by gum tissue and may not frequently encounter the same staining agents. As a result, understanding the role of tooth morphology and common behaviors in oral hygiene can help in identifying the cervical third and interproximal areas as