Tooth decay is the most common chronic childhood disease and the World Health Organization has identified it as a worldwide
problem with 60-90% prevalence among school-age children. Dental caries is a topical contagious infectious disease that affects
people of all ages and in any area of the world. Oral hygiene is a part of public health and oral and dental diseases affect different aspects of quality of life. DMFT is one of the indicators that the World Health Organization has introduced to determine the severity and prevalence of caries. One of the goals of the World Health Organization is to keep the DMFT index of students at less than 2.Different factors are effective in occurrence of dental and interdental caries that we discuss about them in this mini review.