Diagnodent® is a safe fluorescent laser that detects hidden tooth decay accurately, quickly, and in its earliest stages. It is 90% more accurate than X-rays and visual examination alone. Because it exposes caries earlier, more treatment options are possible. The Diagnodent® is usually used during the scope of a regular dental checkup. Each tooth is scanned with the amount of reflected laser light recorded. If there is little or no decay, no light will be reflected back and the score is low. However, if a tooth contains caries of any significance, more laser light is reflected back and a high reading is scored.