Smartooth is a next-generation dentalcare device that provides unprecedented data accuracy in home-use dental health monitoring service. Today, we live in a multi-device era, where people use various healthcare devices. However, currently, there is a lack of dental care devices that offer consumer-centered detected data using at home, and home-use devices still remain within brushing the teeth area. Smartooth provides decay data as accurate as X-ray while being able to measure with more intuitive and easier operation than X-ray, using the optical sensor. SmarTooth can innovatively improve dental healthcare, helping users to monitor their health in its own mobile app.