1. A method for displaying live video of a tooth comprising: a) identifying a tooth tissue region in a viewable image frame obtained from a video stream; b) processing pixel data within the tooth tissue region to identify a suspected caries site; c) modifying intensity values for pixels that correspond to the suspected caries site; d) forming a highlighted viewable image frame as a combination of the modified intensity values corresponding to the suspected caries site and other pixel values in the viewable image frame; and e) displaying the highlighted viewable image frame in video form.