What do the facial surfaces of teeth include?

The facial surfaces of teeth specifically refer to the areas that face the lips and cheeks. These surfaces are composed of both the labial surfaces (which are the surfaces facing the lips) and the buccal surfaces (which are the surfaces facing the cheeks). Therefore, the inclusion of both labial and buccal surfaces aligns with the definition of what constitutes the facial surfaces of teeth.

This combination captures the entirety of the outward-facing surfaces of the anterior and posterior teeth, making it essential for understanding the different parts of the tooth when discussing function, aesthetics, and hygiene in dentistry. Notably, the other combinations mentioned in the other choices include surfaces that are not categorized solely as facial surfaces, such as lingual or incisal surfaces, which pertain to other orientations of the teeth.