The mouth and teeth are the first step in
breaking food down. During the process of chewing, food is
shredded and ground. Powerful muscles move the
or lower jaw, while the food is chewed. The front teeth cut
the food and the back teeth grind the food.
There are three main parts to the tooth:
the root, the neck and the crown. The root is the part
inside the jaw. The neck is a narrow connection between the
root and the crown. The crown of the tooth is above the
First teeth come in between 6 and 8
months. By age 6, baby teeth are gradually replaced by
permanent teeth. There are 32 permanent teeth.
When food is being chewed,
is squirted into the mouth. Saliva helps to soften the food.
It contains an enzyme
that helps break down the starch
in the food.