A processing device is provided, comprising: at least one processor configured to execute a computer readable instructions so as to: acquire one or a plurality of determination images of a subject imaged by a camera from the imaging device including the camera for imaging an image of the subject including at least a part of an oral cavity of a user, acquire biometric detection information of the subject different from the one or the plurality of determination images from the imaging device, determine a possibility of morbidity for a predetermined disease on the basis of a learned determination model stored in a memory for determining the possibility of morbidity for the predetermined disease, the one or the plurality of acquired determination images, and the biometric detection information, and output information indicating the determined possibility of morbidity.