Smart dental detector uses UV LED light source with the wavelength of 405nm to stimulate auto-fluorescence of teeth and FH8610 camera is applied for fluorescence imaging. Then the images can be transferred to mobile phone through WIFI wireless transmission. According to those images, doctors can diagnose caries easily at the early stage of tooth demineralization. So far, more than 300 dentists have used it to diagnose tooth diseases in China. The new technology of diagnosing caries is consistent with traditional diagnosis results. In addition, smart dental detector is an effective and portable device and the artificial intelligence (AI) algorithm is utilized to realize auto-classification.