In a lifetime you will have two complete sets of teeth. First, are the primary teeth or baby teeth. Children usually have 20 teeth.
A baby starts getting teeth at six months and lose them at age 13 years. The roots on primary teeth are not as deep or firmly fixed in the bone as permanent teeth.
The permanent teeth or adult teeth come in between ages 6 and 14 years old.
There are 32 adult teeth in a typical mouth. These teeth should last a lifetime. The enamel of a tooth is the hardest material in your body. It has to withstand the impact of chewing and grinding food.