Milk teeth, the first teeth to erupt in a child’s development. Why they are called milk teeth, is by no means, a proper dental term. Milk teeth is an old and obvious description used in most European languages of what happens while a mother is breast-feeding. The pain associated while the infant is piercing teeth while sucking on his mothers breast gives the term milk teeth.
An infant’s milk teeth start to erupt between 6 to 8 months. It is also normal to start earlier or later as this is only the average. By the age of 5-6, the milk teeth are lost until the full adult dentition is erupted. The full adult dentition is completed by the age of 12-14 years old.
When an adult tooth is missing, it is very common for baby teeth to stay in the dentition until any stage of adulthood. That is, until the milk tooth falls out, decays, or breaks. An unformed or missing adult tooth is mainly a symmetrical occurrence and a genetic predisposition. If a person is missing a tooth on the top left, he is most likely going to be missing the same tooth on the top right. If you are missing adult teeth, look into your family history, and you will find someone with the same condition. This person might be an uncle or someone more distant in the family tree.