Knowing the age is a basic human right, and having it documented is what gives identity to the individual. It determines when a child enters school, if he/she is entitled to minor’s asylum, when he/she can work as well as incriminating offenders rightfully according to their age and protect them and the people around them. In the absence of documents, or when age is disputed, age estimation is inevitable.

Teeth are one of the best age indicators of the humans. Dental development is predictable, robust, and least influenced by environmental factors, which made them the subject of research, when age assessment is involved. The process of dental development is divided into two main parts: tooth formation and tooth eruption. Both of which are used to estimate the age of an individual.

Choosing the right age assessment method relies heavily on the individual in question, in regard to the presence of teeth in the oral cavity or not and whether the subject is alive or not.

In this chapter, dental age estimation methods, most widely used for fetal and children, will be discussed.