The age of 5 years old is not precocious, whether or not precocious generally do not need to change the age of the teeth to determine. Tooth replacement is a physiological process, milk teeth slowly fall out, replaced by permanent teeth, most children from the age of 6 years old, but there are some children at the age of 5 years old, this is a normal phenomenon, around 13 years old, the basic end of tooth replacement, all the milk teeth are replaced by permanent teeth. Precocious puberty generally refers to the appearance of secondary sexual characteristics such as breast development, menstruation, pubic hair, raised laryngeal nodes, whiskers, and coarsening of the voice before the age of 8 for girls or 9 for boys. Teeth changing is not a secondary sexual characteristic, so it is generally not a criterion for determining whether a child is precocious or not. If you are concerned about precocious puberty in children, you can go to a regular hospital for bone age and other related measurements.