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All About Teeth

Why teeth can tell us a lot!

By Natalie Smith
From the February 2023 Issue
Lexile: 910L; 540L

Whether a creature has fangs, tusks, or molars, many animals wouldn’t survive without teeth! Teeth can be used to chew, hunt, defend, or even dig. But for scientists, teeth have a hidden value. They’re treasure troves of information.

When scientists dig for fossils, they often look for dental remains. Teeth are covered in a hard substance called enamel. This helps them last longer than other body parts. The size, shape, and organization of teeth in an animal’s mouth can give scientists clues to its diet.

Many animals wouldn’t survive without teeth! Some creatures have fangs. Others have tusks. Teeth are often used to chew. Some animals use them to hunt or defend. They can even help an animal dig. But for scientists, teeth have a hidden value. They’re full of information.

When scientists dig for fossils, they often look for teeth. Teeth are covered in a hard substance. This substance is called enamel. Enamel helps teeth last longer than other body parts. Scientists can learn a lot about an animal from the size and shape of its teeth and the way those teeth are arranged in the animal’s mouth.

The shape of an animal’s teeth tells scientists what it eats. For example, an animal with pointy teeth for slicing and ripping is a meat eater. Plant eaters generally have square-shaped teeth that allow them to grind up plants.

And since teeth grow and wear down at a steady rate over time, scientists can tell how old an animal was when it died just by looking at its teeth!   

The shape of an animal’s teeth tells scientists what it eats. For example, an animal with pointy teeth is a meat eater. It uses its teeth for slicing and ripping. Plant eaters generally have square-shaped teeth. This shape helps the animal chew plants.

Teeth grow and wear down at a steady rate over time. So scientists can tell how old an animal was when it died just by looking at its teeth! 

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Teeth by the Numbers

Not all animals have the same number of teeth! These are average number of adult teeth for a few common animals.

How many teeth does an average adult human have?

How many teeth does an average adult human have?

A. 21

A. 21

B. 28

B. 28

C. 32

C. 32

D. 54

D. 54

Which full-grown animal has more teeth—a dog or a cat?

Which full-grown animal has more teeth—a dog or a cat?

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Popular Tooth Cleaning Tools in the U.S. in 2021

 

For Brushing Teeth:

Electric toothbrush: 37%
Regular toothbrush: 63%

 

For Flossing:

String floss: 64%
Toothpick: 15%
Electric water flosser: 12%
Other: 9%

 

True or False: More than half of Americans in 2021 used an electric toothbrush.

True or False: More than half of Americans in 2021 used an electric toothbrush.

What percentage of Americans did NOT use string floss in 2021?

What percentage of Americans did NOT use string floss in 2021?

A. 15%

A. 15%

B. 36%

B. 36%

C. 64%

C. 64%

D. 85%

D. 85%

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Tooth Truths

 

  • Teeth are as unique as fingerprints.
  • Plaque can contain more than 300 species of bacteria.
  • Tooth enamel is the hardest substance in the human body.
  • Your bottom two front teeth likely popped out of your gums first.
  • You spend about 1 full day each year brushing your teeth if you brush properly.

Which two teeth were likely first to appear in your mouth when you were a baby? 

Which two teeth were likely first to appear in your mouth when you were a baby? 

How many days would you have spent brushing your teeth if you’d brushed them properly for a decade? 

How many days would you have spent brushing your teeth if you’d brushed them properly for a decade? 

A. 10

A. 10

B. 20

B. 20

C. 24

C. 24

D. 48

D. 48

If you sold toothbrushes, would you stock more electric or more regular toothbrushes? Why?

If you sold toothbrushes, would you stock more electric or more regular toothbrushes? Why?

What does your class think?

If you could switch out your teeth for an animal’s teeth, which animal would you choose?

Please enter a valid number of votes for one class to proceed.

If you could switch out your teeth for an animal’s teeth, which animal would you choose?

Please select an answer to vote.

If you could switch out your teeth for an animal’s teeth, which animal would you choose?

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Teachers: poll your class, then type the total number of answers in the boxes and click “Cast Your Vote.”

Teachers: poll your class, then type the total number of answers in the boxes and click “Cast Your Vote.”

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