Final answer:
An incipient lesion on an interproximal surface is usually located gingival to the contact area, and it represents an early stage of dental decay that occurs adjacent to the gums between two teeth.
Step-by-step explanation:
An incipient lesion on an interproximal surface is usually located gingival to the contact area. This lesion occurs adjacent to the gum line and is an area where dental decay most commonly begins due to the accumulation of plaque and the difficulty in cleaning this area effectively. The interproximal surface is the area between two adjacent teeth, and it's important to maintain good oral hygiene to prevent lesions in this area.
An incipient lesion is an early stage of tooth decay that occurs on the surface of the tooth. When it is located on an interproximal surface, which is the surface between two teeth, it is usually found at the contact area where the two teeth touch each other.