Unit 7 Human Teeth

Unit 7 Human Teeth
Teeth are the hardest thing in the human body.
They are not made of bone.
They are made of enamel, gum and so on.
People use teeth when they eat something or tear something.
How many teeth do people have?
When they are young, they have 20 teeth.
And when they get older, they have 32 teeth all together.