Abstract: To check the status of oral health patients should visit dental clinics and professionals to check inside the mouse and sometimes they take photos or X-ray. There are previous research to detect the dental carries automatically. They often use X-ray (Radiograph), Qualitative Light-induced Florescence using florescence light (QLF), Ultrasonic Caries Detector (UCD), Fiber Optic Trans-Illumination (FOTI) and Electronic Caries Monitor (ECM) mechanisms. But these require the devices built in dental hospitals. Now a days according to the development of modern technology, we can use smartphone to diagnose dental carries. Furthermore, the resolution of smartphone is very high and many people have smartphones. It is very convenient if, we use smartphone to detect the dental carries. We developed a system which makes the users self-diagnosis dental carries using smartphone. So, they do not need to go to dental clinics to check oral health and enhance the possibility to find dental carries in an early stage. Smartphone photos of teeth are sent to the system and after diagnosis processing the results are delivered to the user and dentist. With our system people can easily check the status of dental carries and it will increase the oral health of people