Interproximal

Interproximal simply means "between adjacent teeth." In everyday clinical practice, the term comes up most often when discussing interproximal cavities, the type of decay that forms on the surfaces where two teeth touch each other. These areas are difficult to clean with a toothbrush alone, which is why flossing (or using interproximal brushes) is so important.

The challenge with interproximal decay is that it is virtually invisible during a visual examination until it becomes quite large. The contact between teeth hides the cavity from direct view. This is exactly why bitewing x-rays are a standard part of dental checkups. On a bitewing, interproximal decay appears as a dark shadow on the side of the tooth, and dentists can catch it while it is still small enough for a conservative filling rather than a large restoration or crown. Beyond cavities, the interproximal area is relevant for periodontal health as well. The bone level between teeth is a key indicator of periodontal disease progression, and it is assessed on x-rays by looking at the height of bone in the interproximal spaces. Loss of interproximal bone is one of the earliest radiographic signs of periodontitis.

For your practice, the interproximal space is central to patient education conversations. When patients ask why they need x-rays or why flossing matters, the interproximal cavity is the perfect visual example. Showing a patient their own bitewing with a small cavity between teeth is one of the most effective ways to reinforce the value of both preventive habits and regular radiographic exams.