Dental radiographs are imaging tests for dental professionals, which generally check for bad teeth by comparing the densities. In general, in imaging dental films, our hard tissues generally show high density images, or white images, with enamel showing the highest density images because it is the hardest, followed by dentin, and finally, relative to the lower density images, our bone and alveolar bone. For soft tissues, it shows a low density image, which is the black image we usually see on dental films, where the blackest color is the image of air, and then on dental films it is usually the image of gums, which also shows a relatively low density image. For bad teeth, the most important thing is to check the contrast of high and low density, for bad tooth decay, it is the low density image on the hard tissues of the teeth, that is to say, the blackish image appears on the part that should look white on the dental film, it means that there is caries on that part, and we can see the specific extent of the caries and its depth.