DIAGNOdent is an advanced laser technology that helps us find tooth decay more accurately and reliably in its earliest stages, before it causes more widespread damage. We use it along with visual examination, dental explorers, and x-rays. DIAGNOdent helps us locate decay that’s hidden inside the tooth where visual examination, explorers, and x-rays can’t find it. The DIAGNOdent hand piece scans your teeth with harmless pulses of laser light. When the laser reaches decay under the surface of the tooth, the decay emits a fluorescent light. This fluorescent light bounces back to the sensor, and is translated into an audible signal and a digital readout. In general, the higher the number, the greater the amount of decay in the tooth.