Teeth

Most animals have teeth. Numbers of tooth in the its mouth.
Human's tooth very different from others animals.
Its will change once in their life. New tooth comes
instead of old tooth. For instance, human have milk
teeth first few years.Later, the permanent teeth come later.
There are some kind of tooth in human's mouth.

Without teeth, We can't eat reqular food in daily life.
these teeth help for cut,bite, and chew the food.
Despite human have some kind of tooth, other animals don't have.
For example, crocodiles, they have sharp
teeth and very dangerous. The lion has fore big sharp teeth to to
digest bite others. They use their teeth bite animals' nect.
Some animal has flat teen. They use flat teeth
for chewing. Hippos eat grass and the grass
is not easy digest. They will re-chew it slowly.

For human, we have eight front teeth for cutting things.
We have four teeth for biting and we have flat teeth for chewing.
Each tooth has to be brushed every day. Don't be lazy.