People grow two sets of teeth during their lifetimes the primary or baby teeth, and the second, permanent teeth. The first primary teeth appear when a child is about six months old. The rest of them erupt between sixth and thirtieth month, and there are only twenty teeth in this set.
The permanent teeth in humans appear between the sixth and fourteenth years of a child’s life. In many cases, the children still have their baby teeth as well as the permanent set, or some of them, until they are about ten or twelve. This can look very odd, because the permanent teeth are often bigger than the baby teeth, and because the first of the second set to appear are usually the two front teeth, making the child look very peculiar. There are thirty two teeth in the second set, although the four wisdom teeth don’t usually appear until the person is in his or her late teens or early twenties. It is as well to remember that this set is the one you will have for the rest of your life, so great care must be taken to make sure that they won’t go bad and have to be pulled out!