What is the term for the side surface of teeth that faces the back of the mouth?

The term for the side surface of teeth that faces the back of the mouth is indeed referred to as the distal surface. This surface is specifically defined as the area of a tooth that is farthest away from the midline of the dental arch, which typically corresponds to the center of the face. In human dentition, this is particularly relevant when considering the orientation of teeth in relation to the mouth's anatomy.

Understanding this term is important in dental health as it helps in identifying areas that may be prone to decay or require cleaning, as well as in terms of planning for dental procedures. The other terms refer to different surfaces of the teeth; for example, the occlusal surface is the top surface used for chewing, the mesial surface is the side facing the midline, and the facial surface refers to the side of the tooth that is closest to the cheeks or lips. This knowledge of tooth surfaces is essential for both dental professionals and patients in maintaining oral health.