Final answer:
The proximal surfaces of two adjacent teeth in contact form the borders of the interdental space, an important area for preventing food trap and maintaining oral hygiene.
Step-by-step explanation:
The proximal surfaces of two adjacent teeth in contact form the borders of the interdental space. The interdental space is an area beneath the contact point between the proximal surfaces of two joining teeth. It is a part of the gingival architecture that helps maintain food from getting trapped between teeth and is important for oral hygiene. Adjacent teeth create several spaces for food debris removal and contain aesthetic elements. Embrasures, on the other hand, are spillways designed to direct food away from the gums and are also made by the contact of adjacent teeth. The interdental col is the depression of the gum tissue beneath the contact area between adjacent teeth. Lastly, line angles are angles formed where two surfaces of a tooth meet. In this context, the correct answer is the interdental space, which is bordered by the proximal surfaces of adjacent teeth.