The Proximal Caries Light Guide from AdDent is a plug-in accessory for the Microlux Diagnostic System. This attachment uses a 0.75mm diameter disposable fiber light guide that allows the clinician to easily slide the fiber through the posterior interproximal space. This technique permits visualization of proximal caries as a shadow on the occlusal surface with the use of transillumination. It can often show incipient proximal caries not visible on a standard x-ray.