Front teeth usually have only one root but back teeth can have as many as three roots. When the time is right, our bodies have special cells that slowly eat away the roots of the teeth. As the roots get shorter, the teeth start to become loose. Finally, most of the root disappears and the tooth falls out!

Why do milk teeth fall out?

Milk teeth fall out when the permanent teeth under them start erupting. The erupting force of the permanent teeth causes the roots of the milk teeth to resorb or dissolve. This makes the milk teeth to loosen up and eventually, with no support of the root underneath them, they fall out.

At what age milk teeth start falling?

Milk teeth

Babies' teeth begin to develop before they are born, but in most cases don't come through until they're between 6 and 12 months old. Most children have a full set of 20 milk or baby teeth by the time they're 3 years old. When they reach 5 or 6, these teeth will start to fall out, making way for adult teeth.