> One of the factors that are effective in the spread of tooth decay in children is the parents' misconceptions about milk teeth and their neglect of the growth of permanent teeth, especially the first permanent tooth that develops at the age of six. Many children who visit the office have several decayed milk teeth in their mouths, which their parents do not treat, and they think that milk teeth are temporary teeth, and they consider the cost of restoration, nerve extraction, and coating useless for teeth that fall out later. The percentage of acquired malformations that require orthodontic treatment is caused by the early loss of primary teeth, certainly more efforts are made to maintain primary teeth. One of the complications of early loss of milk teeth is the loss of space necessary for the proper growth of the lower permanent teeth and the permanent teeth being hidden. Methods of prevention and restoration of caries of milk and permanent teeth.. This can greatly contribute to the general health of the society. Decayed milk teeth cause decay to spread to milk and permanent teeth inside the mouth. On the other hand, if the baby tooth infection reaches the root area and the bone between the baby roots, it causes decay of the permanent teeth under the baby teeth.. ### **Related article:** ### The importance of oral hygiene in children