DIAGNOdent pen offers a friendly method for early detection of periodontitis and suitable diagnostics of caries. Adequate information for diagnostics is obtained with a combination of a classic probe and radiograph but the mechanical identification leads to damage of healthy tooth tissues. The patients undergo pain and stress during restoration process. X-ray exposes patient to radiation and does not provide reliable detection of caries. DIAGNOdent pen uses LASER fluore- scence method for diagnosis and detection eliminating usage of X-ray and any damage to the tooth tissues.