Today, I just can’t stop smiling.
Do you want to know why?
Because I want to show off my teeth!
Teeth aren’t just for smiles -- they’re a really important part one of my favorite
things...eating!
What do you like to eat? I like to eat carrot sticks, peanut butter and jelly sandwiches, pasta, and
lots of other things!
So if you’re like me, you probably eat lots of different kinds of food!
And that’s why you have lots of different kinds of teeth!
We use our teeth to chew our food. Chewing takes food that would be too big to fit in
our mouths, or too hard to swallow whole, and breaks it down into smaller pieces.
You couldn’t just open wide like a snake and swallow a whole pizza!
You need your teeth to rip it into bite-sized pieces first, and then keep making it smaller
and mushier, until you can gulp it down.
Our teeth are great at turning lots of different things into tasty meals.
They all have slightly different jobs -- and different shapes -- to help us eat all those
foods!
Take a look inside your mouth. And the next time you lose a tooth, have a close look at it!
When you smile, you can see your front teeth really well. They’re called incisors, and
you have four on the top and four on the bottom.
These are the teeth that help you take that first bite of food. Think about chomping
into a sandwich, or taking a bite out of an apple.
You use those front teeth first to cut into the food, and break off a bite-sized piece.
And you can see another kind of teeth when you smile, too -- they’re the longest and
pointiest teeth in your mouth.
They’re called canines, and you have four of them -- two on the top and two on the bottom.
These teeth are especially good for ripping and tearing food. They have long roots that
go deep into your gums, so they can do a lot of hard work.
For example! How would you bite off a piece of something super chewy, like a big piece
of a bagel? Or a hard sticky piece of taffy?
That’s where your canines go to work! These strong teeth can hold the chewy bread or stretchy
candy in place even when you’re pulling on it, so you can break off a piece to eat.
Now, if you look further back in your mouth, you can see teeth that are bigger, flatter
and kind of squarish.
These are your premolar and molar teeth.
The premolars are a little bit smaller than the molars, but all of these teeth have wide,
bumpy surfaces instead of sharp edges.
Their shape makes them really great at grinding and crushing food, especially food that comes
from plants -- think about how long it takes to chew up a stalk of celery!
While the teeth in front are in charge of biting, these back teeth do most of the hard
chewing. They’re the last teeth that your food will meet before you swallow!
We’re lucky we have all these different kinds of teeth, because it means we can eat
lots of different kinds of food.
Some animals have only one kind of tooth, or more of one kind than the other. Their
teeth are specially suited to the types of food they eat.
Animals, like elephants and deer, eat mostly plants. So most of their teeth are those big, broad,
lumpy molars to break down thick plants.
And other animals, like squirrels, eat plants, too, but they don’t just pluck a
leaf off of a bush -- squirrels have to chew through the bark of a tree, or through hard
seeds and nuts, to get to their food.
So these animals have molar teeth and really big incisors. The incisors help them chew
through the tough stuff, and their molars help them grind up the plant matter.
Now, other animals, like tigers, only eat other animals--they eat meat.
So these guys need really big, sharp canine teeth, to help them catch, and then tear into,
their prey.
Their teeth help them take food that’s too big to fit into their mouths all at once,
and break it up into smaller pieces. So, all animals have special teeth that match their diet.
Scientists can sometimes figure out what kind of food an animal eats, based on the shape,
size, and number of teeth they have!
Luckily, we can eat all kinds of things -- stretchy things, chewy things, soft things, tough things,
slippery things and lots of other things.
...and that’s something to smile about!
Thanks for joining us on SciShow Kids. And make sure to check back every week
to learn more with Squeaks and me!
And we'll see you next time!