The study of genes, from molecules to populations, is known as genetics. In dentistry, even within families, there are many variations in people's dentofacial traits. When we analyze a certain characteristic or condition in dentistry, we frequently find that it is the result of two main causes, genetic and environmental. The discussion will center on how genetics may have a role in common dental conditions such dental caries, periodontal disease, and malocclusion, the genetic abnormalities that occurred during the development of teeth.