When do human's first teeth appear?
The first teeth appear when we are about 6 to 12 months old. By 3 years old we have our first set of teeth. There are 20 baby teeth.
How many permanent teeth are there?
By about age 12 or 13, most kids have lost all of their baby teeth and have a full set of permanent teeth.
There are 28 permanent teeth in all.
Between the ages of 17 and 21, four more teeth called wisdom teeth usually grow in at the back of the mouth. They complete the adult set of 32 teeth.