Research has shown that most initial carious lesions are found on occlusal surfaces. In addition, the widespread use of fluoride has resulted in harder enamel surfaces. Recent studies have focused on carious lesions, called hidden caries, that are difficult to detect by conventional visual, tactile, and radiographic techniques. The newly developed DIAGNOdent, a diode-laser caries detector, can be used to determine the soundness of tooth structure on occlusal surfaces, which will aid clinicians in determining whether a tooth should receive remineralization therapy, a sealant, or would benefit by more invasive restorative procedures. It is estimated that 30% to 50% more occlusal caries will be detected at earlier stages with this device. Dental hygienists perform patient-assessment procedures on a regular basis and will find the DIAGNOdent an ideal patient-assessment tool.