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After that first tooth breaks through, more and more teeth begin to appear. Most kids have their first set of teeth by the time they are 3 years old. These are called the primary teeth, baby teeth, or milk teeth and there are 20 in all. When a child gets to age 5 or 6, these teeth start falling out, one by one. A primary tooth falls out because it is being pushed out of the way by the permanent tooth that is behind it.
The baby teeth have not come out like they were supposed to. It is most common with the lower front teeth when the child is six years old and then the upper back molars when the child is around eleven years old. A common emergency is when a parent notices a permanent tooth coming in behind a primary (baby) tooth.