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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.
At What Age Do Babies Start Teething? According to the American Dental Association (ADA), a baby's first tooth often appears anywhere from eight months to a year of age. The last teeth to grow in are usually the molar, or back teeth, which often start making an appearance anywhere from 13 months all the way up to 33 months.