1. A method for displaying live video of a caries condition of a tooth, the method comprising: identifying a tooth tissue region of a single color plane in a single viewable image frame obtained from a video image stream of the tooth; processing pixel data within the tooth tissue region of the single color plane to identify pixels that correspond to a suspected caries site, wherein processing the pixel data comprises inverting pixel values of the pixels that correspond to the suspected caries site; modifying intensity values for the pixels that correspond to the suspected caries site; forming a single highlighted viewable image frame by adding the modified intensity values for the pixels to other pixel values in the single viewable image frame; and displaying the live video including the single highlighted viewable image frame.