Answer
The permanent molars of an adult dentition (last three teeth in each jaw) did not replace any temporary teeth of a primary dentition. The primary premolars and all forward teeth are replaced by permanent between the ages 6-7. The first of the permanent molars start erupting at about age seven. The last molars (most posterior of the three in each jaw) may not until late adolescence or early adulthood.
Work Step by Step
The first of the permanent molars of the adult (permanent) dentition start erupting at 6-7 years of age. They show up posterior to the temporary molars, but they do not replace any milk or temporary precursor teeth. The last permanent molars may not show up till late adolescence or early adulthood. In some individuals, the very last permanent molar never erupts at all; it has to be extracted in some young adults.
