Lesson video

Hi everyone.

My name is Miss Hummel and together we'll be answering the question, are all teeth the same? In this lesson, we will learn about human teeth as well as some fun facts about animal teeth.

We will also learn about the different types of teeth in humans.

And finally, we will learn.

We will discuss the differences in teeth between herbivores and carnivores.

Our lesson will follow this structure.

First, we will discuss what teeth are.

Then we will look at types of teeth and how they differ.

Finally, we will focus on the difference between carnivores and herbivores and how this affects their teeth.

In this lesson, you will need an exercise book or paper, a pencil or pen, a coloured pencil or pen and a ruler.

If you haven't got those things, pause the video now and go get them.

Here are a star words, which are the most important words of our lesson.

I'm going to save them and ask you to repeat them after me.

When I point at myself, it will be my turn.

And when I point at you, it will be your turn.

Skull.

Teeth Milk teeth.

Wisdom.

Molar.

Canine.

Premolar.

Incisor.

Omnivore.

Herbivore.

Carnivore.

Amazing.

Now we will begin by discussing what teeth are.

I would like you to begin by completing this task.

What do you know about teeth already? Complete the spider diagram with anything that you know.

You can pause the video now to complete the task and you can resume once you've finished.

Teeth are used for cutting and chewing food.

They start the digestive process, which gives us the energy that we need to live.

Teeth are used for cutting and chewing food.

And they start what process? The digestive process.

Well done.

Can we come up with an action for this whole definition? So maybe we could say teeth, you can point at our teeth are used for cutting.

We can cut like with a knife and chewing.

They start the digestive process.

We can rub our belly.

You can't really see me doing it, but you can imagine it, which gives us the energy that we need to live.

I'm going to do like that with my heartbeat, that means that we're living.

So teeth are used for cutting and chewing.

They start the digestive process, which gives us the energy that we need to live.

See if you can do that and try and remember.

Now babies' teeth start to show when they're six or seven months old and they often say, this is actually very painful for those babies, because their teeth are breaking through their gums. And so it hurts for them.

And sometimes they cry a lot in this period of their lives.

Most children will have a full set of 20 milk teeth, by the time that they are three years old.

What do you think we mean by milk teeth? Milk teeth are not our permanent teeth.

They will eventually fall out.

I would now like you to pause the video, to think about this question.

Most children will have a full set of 20 milk teeth, by what age? You can resume the video once you've finished.

Hopefully you said by the age of three years old.

Then at the age of five or six, these teeth are pushed out by permanent teeth growing behind the milk teeth.

So they have the milk teeth and kind of underneath or above, depending if they're the bottom teeth or the top teeth, they have permanent teeth that will eventually kind of push it off and make it fall off.

I would like you to pause the video now to think about these questions.

When did your teeth fall out? And have you had all of them fall out yet? Or even have you had any of them fall out? You can resume the video once you've finished.

Personally I think I will need to ask my mom about when all my teeth fell out, because I really do not remember.

By the age of 14 which is kind of when you begin to become a teenager, most children have lost all their milk teeth and they have a full set of 28 permanent teeth.

Then around age 20, four more wisdom teeth usually grow at the back of the mouth and they complete the adult set of 32 teeth.

Have you heard of wisdom teeth before? Pause the video now to think about this question.

How many more teeth will most adults have than children and teenagers? You can resume the video once you've finished.

When comparing adults to teenagers, adults will usually have four more teeth, which are their wisdom teeth.

And when comparing adults to children.

Well, children have their milk teeth before their permanent teeth come in.

And there's only 20 of those.

But we have 32 of adult teeth.

Many other animals have two sets of teeth too.

for example cats and dogs.

This means that they start with one set of teeth and these fall out and make way for other more permanent teeth.

Other animals like sharks, grow new teeth all throughout their lives.

And some animals like penguins have no teeth at all.

I'm going to look at that picture there and see if I can spot any teeth.

I don't think I can.

Now dolphins have more teeth than any other animal.

Some dolphins have over 200 teeth.

that is so many teeth that dolphins have.

Then elephants have four sets of teeth in their lifetime and their tusks are the longest teeth in the world.

So elephants have a total of 26 teeth and then their tusks count as two of those.

They have 24 other teeth and these tasks count as two.

So those tasks are the longest teeth in the world.

Doesn't surprise me.

I would like you to pause the video now to think about this question.

Which animal has more teeth than any other animal? You can resume the video once you've finished.

Hopefully you said dolphins who have over 200 teeth.

Sharks are an interesting one.

So they lose teeth each week.

Imagine losing your teeth every single week.

They get new teeth when they lose their old ones and they may have over 20,000 teeth in a lifetime.

I think I remember having a necklace when I was younger, that had a shark's tooth.

Lastly, for the animal kingdom, for us to know about some poisonous snakes have hollow teeth.

That means that they're not filled, called fangs, which eject poison.

Okay.

So they're probably hollow so that they can get the poison through them.

I would like you to pause the video now to think about this question.

Sharks can have up to how many teeth in a lifetime? You can resume the video once you've finished.

They can have up to 20,000 teeth.

Now that we've gone through all these teeth facts, I would like you to write down your favourite fact about teeth so far.

My favourite one is that dolphins have 200 teeth, that is so many.

Pause the video now to write down your favourite fact and then you can resume once you've finished.

We're now going to discuss the different types of teeth that we have.

There are four types of teeth.

We have canine, incisor, premolar, and molar.

You can see them all here on the screen.

Now, can you notice any differences in what they look like? And why do you think each of those teeth? Sorry, What do you think each of those teeth could be good for? Now, let's see if you know what each of them could be good for.

So in this activity, I would like you to match the teeth to their function.

On the left hand side, we've got the name.

So we've got molar, premolar, incisor and canine.

And then on the right hand side, we have the different functions and we've got used for biting and cutting food.

Used for grinding food.

Used for tearing and ripping food.

And used for holding and crushing food.

Pause the video to complete that task.

And you can resume once you've finished.

Get ready to mark your work as we go through the different types of teeth.

First, we've got incisors.

Incisors help you bite off and chew pieces of food.

Your eight incisor teeth are located in the front part of your mouth.

You have four of them in your upper jaw and four of them in your lower jaw.

Incisors are shaped like small chisels.

They have sharp edges that help you bite into food.

Whenever you sink your teeth into something like an Apple, you use your incisor teeth.

Incisors are usually the first teeth to what they call erupt, appearing when they're, when children are about six months old.

The adult set grows in between the ages of six and eight.

Now we've got canine teeth.

These teeth are used for tearing and ripping food.

Your four canine teeth sit next to the incisors.

So we've got our incisors four at the top four at the bottom.

And then we've got our two canine teeth kind of on the side of those.

You have two canines from the top of your mouth and two on the bottom.

Canines have a sharp pointy surface for tearing foods.

So they're probably the pointiest teeth.

The first baby canines come in between the ages of 16 months and 20 months.

So that's over a year old.

The upper canines grow in first, followed by the lower canines.

Lower adult canines emerge in the opposite ways.

So first, the lower canines poke through the gums at about the age of nine.

And then the upper canines come in at the age of 11 or 12.

Next are premolars.

These help you hold, crush and grind your food.

Your eight premolars sit next to your canines.

There are four premolars at the top, and four at the bottom.

Premolars are bigger than canines and incisors.

They have a flat surface with some ridges, for crushing and grinding food into smaller pieces to make it easier to swallow.

And baby molar teeth are replaced by adult premolar teeth.

Infants and young children don't have premolars because those teeth don't start to come around, until about the age of 10.

Lastly, we've got molars.

These are used for grinding food.

Molars are special teeth found in mammals and also the most complex sort of teeth.

Human have 12 molars in total, in four groups of three at the back of the mouth.

The molar which is the furthest back in each group is called a wisdom tooth.

Not everyone has enough room for their mouth for this last group of teeth.

Sometimes the wisdom teeth are impacted, meaning that they're stuck under the gums. And this means that they don't have space to grow in.

If you don't have room for your wisdom teeth, you'll likely have to have them removed at some time.

Personally, apparently I grew molar teeth, but they don't have the roots that you can see in the picture here.

So they'd never be able to push up and grow in my mouth.

I would like you now to use the knowledge that we just heard about to try and think based on these descriptions, which colour represents which type of tooth.

Pause the video to complete the task and you can resume once you've finished.

Hopefully you figured out that the orange teeth are our canines, which are our sharpest teeth.

Green are incisors that help us bite food like apples.

We have our premolars in yellow, and our molars in blue.

So try and feel your teeth.

I know that sounds silly, but try and go in front of a mirror, If you've got one.

And try and feel which teeth you have, are they molars? Are they canines? Are they incisors? Have you got all of them? You know, are you missing any of them? You know, if they've fallen off, where are you right now? For the final part of our lesson, let's focus on the difference between carnivores and herbivores.

First, I would like you to think back to any other lessons or previous knowledge.

Do you remember what a herbivore and a carnivore are? What can you remember about them? Now, pause the video to complete this task.

And you can resume once you've finished.

Hopefully these are some of the things that you remembered.

So animals that eat other animals are called carnivores.

And animals that eat only plants are called herbivores.

Carnivores and herbivores do have different types of teeth to suit the type of food that they eat.

What animals can you see on this slide? And which one is the herbivore? And which one is a carnivore? Hopefully you can see that we've got a deer and a Wolf.

The deer is the herbivore.

The Wolf is the carnivore.

Herbivores have teeth which are shaped to squash and grind plants.

As you can see, they have small incisors and lots of premolars and molars.

Those premolars and molars really help them to squash and grind those plants.

Then we've got carnivores.

Carnivores have teeth which are shaped to slice and rip the meat that they're eating.

Carnivores have incisors as well.

But they also have really long canines.

Like you can see in our diagram, they have some premolars and something called carnassial teeth too.

I would now like you to answer these questions.

Number one.

What are some of the similarities between the teeth of the deer and the wolf? Number two.

What are some of the differences between the teeth of the deer and the Wolf? Number three.

Why do you think that the deer and the Wolf have different teeth? Pause the video to complete this task, and you can resume once you've finished.

Get ready to mark your work, that both the deer and the wolf have premolars and incisors.

However, for the difference, you may have mentioned that the wolf has canines and carnassial teeth and the teeth has more molars and premolars.

Lastly, why do you think the deer and the wolf have different teeth? Well, deer eat different kinds of food to wolves.

The food that they eat requires more chewing and grinding and wolves require teeth that will help them tear and rip raw meat.

Omnivores, like humans eat both plants and other animals.

They have sharp teeth in the front and flat teeth at the back.

However, our canines have got smaller over time because the majority of the meat that we eat is cooked.

And therefore it's not as difficult to tear that food apart.

Now it's your turn to answer this question.

Why do you think that humans have sharp teeth at the front and flat teeth at the back? Pause the video to complete this question and you can resume once you've finished.

Finally, for our last task today, I would like you to answer this question.

Do you think that these teeth in the picture belong to a herbivore or a carnivore? And why do you think that? You can pause the video to complete the task and you can resume once you've finished.

Hopefully, you said that this belongs to a carnivore.

You can very clearly see the canines, which are sticking up quite a bit.

And those are a really distinguishing feature, which is telling us that they are carnivores.

We have now finished our lesson and it is time for you to complete your exit quiz.

You need to exit the video and complete the quiz to test your knowledge and understanding of this lesson.

I hope you enjoyed the lesson.

Bye.