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Detection of dental caries in the early stage is most important in the dental field. But identifying the severity in caries help to take the action according to severity levels, According to ICDAS (International Caries Detection andAssessment System) guidelines for clinical images. The main aim is to identify the severity levels of the caries with different colors or shades which can be easily noticed by practitionerusing. Mainly the images taken are radiographic or clinical because these are the cheap, easy to extract, save and modified by using digital image processing and machine learning. Most of the previous research is done by analysing radiographic images of Occlusal and Buccal surfaces, but there are both advantages and disadvantages in this detection methods which is explained here in detail.