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When children are small, their jaws are also small, which means that there is no room for very large teeth to fit on top of their jaws. That is why when they cross the age of two or two and a half years, their baby teeth start to erupt, and these baby teeth remain in the socket until their jaws become large enough for permanent teeth to gradually erupt. In fact, there is a very strong scientific and natural reason behind this, and that is that when our jaws are small, big teeth will not be able to fit on them. Big teeth need more strength, and in children, because the bones are also in the growing stage and they are also weak, that is why they cannot hold more teeth or grow larger teeth on them. That is why children have about 20 baby teeth that act as placeholders. You must have often noticed that there is some distance between the baby teeth of children. And this gap actually shows that as the child grows, the size of his jaw increases, which increases the distance between the teeth and a larger tooth has to fit in this gap. There are certain bacteria found in the human body or certain things that weaken the roots of milk teeth and at the same time fix strong permanent teeth there after they fall out. Therefore, it is a great law of nature that milk teeth come out of children and the number of permanent teeth is about 32, while the number of milk teeth is 20.