People have two sets of teeth. They have 20 deciduous "baby" teeth, (Sometimes also called milk teeth or primary teeth) and 32 permanent teeth. (also called adult teeth)
Deciduous teeth can start poking through the gums as soon as 3 months to a year after birth. All of the "baby" teeth will arrive before the age of 3. Humans begin to loose their first set of teeth at age 6. The permanent teeth will begin to come in as the first set is lost.
As an adult you will have 32 permanent teeth. They are called permanent because these teeth are supposed to last you the rest of your life with the proper care. These teeth follow the first set. As a baby tooth falls out a permanent tooth replaces it. Some people are born with more teeth these are called supernumerary teeth. Some people are born with less teeth. The most commonly missing teeth are "wisdom" teeth. These are the set of permanent teeth people get. Some people will have other missing teeth. It is not uncommon to be missing permanent teeth.
Here is a diagram of all the teeth Humans have.
Here is a diagram of all the teeth Humans have.
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