Hello scientists! My name is Mr. Wilshire and in this lesson we are going to be looking at types of teeth.

Our outcome for our lesson is to identify and name different types of teeth in humans.

There are some key words for our lesson to help us.

The first of which is "teeth".

Then we have "observe".

Next is "incisors" and we have "canines".

Last up, "molars".

I wonder if you know where some of those teeth are or where some of those key words are to link to your teeth.

Here are some definitions of the different words as well.

Now don't worry if you're not too sure what some of these mean.

As we discuss things throughout our lesson, hopefully they'll become a little bit more obvious to you.

You can pause a video here if you wish, and go through some of the definitions of the words you're not too sure of.

Restart when you've done that.

Let's take the first bite out of our lesson.

It's called "Observing teeth".

If you move your tongue around inside of your mouth, what can you feel? Hmm.

(grunts) No, sorry.

Get started with that part of this lesson and then restart when you've done that.

Hmm.

Hopefully you've had a good chance to move your tongue around your mouth.

I wonder what you could feel.

Maybe you look like the person in the picture down there.

Now you should be able to feel all your teeth inside of your mouth.

Now, if you move your tongue around again, have a think about what they feel like.

Restart when you've done that.

So what did your teeth feel like? Did they feel bumpy? Did they feel rough? Did you have any gaps in your mouth where there should have been teeth? Some of you may have lost some teeth and had other teeth started to grow in their place.

Wonder what that felt like.

Could you feel anything above your teeth or below your teeth? Are some of your teeth sharp? Hmm.

Let's move on and find out more.

Think about what your teeth felt like with your tongue as you rubbed your tongue along them.

What did they feel like? Pause the video and have a quick discussion.

Share some words of what your teeth felt like.

So I wonder what your teeth felt like.

When I was feeling mine with my tongue, (hums) they felt a little bit smooth.

They did feel sharp in some cases, and especially at the back, I felt rather big.

I wonder if you felt any of those as well.

Did you feel smooth or rough? Maybe sharp and pointy? And anything else at all? Jun says," Some of my teeth feel flat and other teeth feel bumpy." Hmm, I wonder if yours felt like that too.

Actually I can feel some bumps there now.

Hmm.

They're very smooth and in some cases they are a little bit bumpy.

What other senses can we use to describe our teeth? Can you smell your teeth? (sniffs) I don't think my nose can reach down into my mouth.

Hmm.

Have a quick think and a discussion and restart when you've done that.

If you have a mirror nearby or somewhere in your classroom, you could use a mirror here to observe your teeth Decide where you are learning if you are safe to do that.

If you can get hold of a mirror, wonder what words you can use to describe what your teeth look like.

Yeah, of course, that's one of our senses.

We can use our eyes to look in a mirror and we can describe our teeth.

I'm gonna get a mirror as well and have a go looking at my teeth.

Restart when you've done that too.

Hmm.

When you were looking in a mirror at your teeth, did you spot that your teeth were white? Were they straight? Were they crooked? Were they anything else? Let's pause and think.

Which word means to look very closely? Is it "listen", "feel" or "observe"? The answer here, is to observe.

If we're looking very closely, we are observing what is going on.

Now these people use a mirror to observe teeth and other areas inside your mouth more easily.

Do you know what jobs they're doing? There's a picture there of somebody with a mirror going inside her mouth and there's someone else there in different types of clothing with a mirror going inside her mouth.

What kind of jobs are they doing? That's not something you would usually do is it? Pause the video and have a quick discussion.

Restart when you've done that.

Hopefully you've had a good discussion about the types of jobs that you can see here.

I wonder if you said, "a dentist".

A dentist is trained to care for teeth and gums. That's why they're being very careful and putting a mirror inside their mouth.

A dental hygienist here is trained to clean teeth and teach you how to look after your teeth.

Ah.

So one of those jobs is to make sure that the teeth are nice and clean and the other job is to teach you how to care for teeth and gums. They're both very useful jobs, aren't they? They both use a tiny mirror to go inside your mouth and have a little look.

You can't if you move around, see every part of your teeth.

So using a tiny mirror like that is really useful to be able to see behind them.

Now this special type of mirror is called a concave mirror.

It's used to observe teeth more closely.

This is what it looks like here.

The concave mirror is curved inwards, so that means that it will magnify what is reflected off its surface.

It's like a little mini magnifying glass, but you can look into it and the reflection will bounce back at you.

This means the image of teeth in the mirror, are a lot larger and a lot easier to see.

Look, you can see them in that image there, can't you? The dentist is having to use the tool to help keep the mouth open and then the other tool is used to see underneath the teeth.

That means that the dentist or the hygienist can stand where they are and keep looking at the teeth as they move the mirror around.

They don't need to keep moving their head to try and see inside your mouth.

A dentist and a dental hygienist are very useful jobs, aren't they? 'cause if you are not looking after your teeth properly, then they might start to hurt you.

It's their job then to go in and have a look and see how best you can improve your brushing techniques to make sure your teeth stay healthy.

Or otherwise, they'll start going a little bit brown and black, won't they? And they won't be very nice.

Let's stop and think here.

What would a dentist use to observe teeth in your mouth? Are they going to use a shiny spoon, a concave mirror or a smooth piece of glass? Some of those sound a bit dangerous, don't they? Yeah, a concave mirror is going to be much better for a dentist to see inside your mouth.

I wouldn't want to put glass in there.

Here's task A then.

Use a mirror to observe your teeth closely.

You are going to need to then use some coloured dough to make a model of your bottom gums. If you add some dough teeth to it as well, you can then try and make sure that there's the same amount of teeth inside, just like in your mouth.

Try to make the same sized and shaped teeth as in your mouth as well.

So you're going to need two different types of dough, one for the gums and one for the teeth.

Use a mirror to help you observe your teeth and try and replicate that in your model.

Best of luck with that task.

Restart when you've done that.

Okay, so here you can see an example model.

Jun said, "Is your model similar or different to mine?" Wow, I think he's done a good job there, hasn't he? There's some flatter teeth at the back of the mouth.

There's some thin teeth at the front of the mouth.

They do look quite smooth as well, don't they? Remember, the bottom set of teeth was these ones down here.

Let's snap straight to the next part of our lesson.

This part is called "Teeth have different names".

Human teeth begin to develop before we are born.

At birth, our teeth are in our jaws, waiting to push through our gums as we grow.

And teeth usually start to push through our gums at around six months until three years of age.

That's right.

I remember when my children were born, they didn't have any teeth at all.

They only had their gums. Our first set of teeth are known as our baby teeth or sometimes also known as milk teeth.

Scientists will call these deciduous teeth.

I wonder if you can guess why, using some of your scientific knowledge.

Pause the video and have a think.

Restart when you've done that.

Could you guess why they're called deciduous teeth? Well, "deciduous" means to fall out or fall off at a certain stage of growth, just like a deciduous tree would lose its leaves.

Around the age of six, our deciduous teeth will all begin to fall out and soon after, another set of teeth replace them.

These are called our final set of teeth.

They're also sometimes known as our adult teeth 'cause we're going to have these all throughout our adult life.

Teeth have other names too, depending on their shape and size, where they are in your jaw and what job they do when we eat food.

You can see a model of some teeth there.

I wonder if you know the name of any of these other types of teeth.

Maybe they're called "Bob" or "Dave".

That doesn't sound right, does it? Well, have a little think and restart the video when you've done that.

I wonder if you were able to use some of your scientific knowledge to name some different types of teeth.

"Bob", "Dave", and "Sandra" don't sound like scientific names, do they? Hmm.

Let's find out the names of some of these teeth after this.

True or false? All teeth are the same shape and size.

The answer here is false.

Teeth are not all the same shape and size.

So let's justify our answer here.

Is it because teeth are different shapes and sizes so they can push through your gums? Or is it because teeth are different shapes and sizes depending where they are in your jaw? Pause the video and have a discussion.

Restart when you are ready.

The answer is," Teeth are different shapes and sizes depending on where they are in your jaw".

Not just because they have to push through gums. At the front of the jaw, these bits here, humans have teeth called "incisors".

Here's some examples of incisors.

Most children and adults have eight incisor teeth.

1, 2, 3, 4, 5, 6, 7 and 8.

As long as you've got clean hands, hopefully you can feel where they are in your mouth as well.

Incisors will look flat, smooth, and almost rectangular shaped in your mouth.

Have a little feel around with some clean hands in your mouth.

Hmm, I can feel that at the front there.

Left and right of the centre of the jaw, humans have got teeth called "canine teeth".

Look, you can see a pointier tooth in that picture there, can't you? Just to the side of the incisors.

Canines are sometimes called "eye teeth" because they're positioned underneath our eyes.

Oh yeah, they are.

Children and adults usually have four canine teeth.

Canines will look sharp and more pointed than other teeth.

With some clean hands again, see if you can find those pointy teeth to the side of your incisors.

Here's the flat incisors and that one feels flat and ah, it is pointy.

There! I can feel it.

And that one there.

And these ones as well.

At the back of your jaw, humans have teeth called "molars".

You can see there inside the model of some teeth.

Well, there's a great big cube looking tooth called a molar.

Most children have got eight molars and most adults have eight pre-molars, which are smaller molars.

They also have 12 molars as well.

Molars look wide and flat, but bumpy.

Be very careful here with your clean hands, but you should be able to feel those wide and flat, bumpy teeth at the back.

Certainly not very similar to the flat teeth that are at the front of the mouth.

Stop and think here.

"Name that tooth!" "This tooth is found to the left "and right of the centre of the jaw.

"It's under the position of your eyes.

"This tooth looks sharp and pointy." Is it the molar, the canine, or the incisor? This tooth is the canine.

Well done if you got that right.

"Name that tooth!" "This tooth is found at the front of the jaw.

"This tooth looks flat and smooth." The answer here is an incisor.

"Name that tooth!" " This tooth is found at the back of the jaw.

"This tooth looks wide, flat, but bumpy." Is it the molar, the canine, or the incisor? The answer here is molar.

So here's the final task of our lesson.

Part one of this task says to place the model of teeth that you made in task A on a mini whiteboard or a piece of paper.

Label the different types of teeth that you have made "incisor", "canine" and "molar".

So place a whiteboard or piece of paper flat down on the table, put your model on top and then start to label.

Best of luck, restart when you've done that.

Now your model may have looked a little something like this when you completed it as the incisors at the front and then the pointy canine tooth afterwards, followed by the molars at the back of your mouth.

Jun says," Is your model similar or different to mine?" Yeah, have a little go comparing and then move on when you are ready.

Part two of this lesson is to use a mirror here to observe and your tongue to feel.

Can you count how many incisors, canines, and molars that you have in your mouth? Hmm.

Alright.

Using your tongue, you have to put it all around your mouth.

"Compare the number of each type of tooth you have with the information below." "Children usually have eight incisors", "Children usually have four canines" or "children usually have eight molars".

Have a go counting with your tongue and have a go looking with your mirror.

Restart when you've done that.

So here's Sam and Jun and they've been having a quick discussion too.

Sam says," I counted 17 teeth in my mouth.

"Three of my incisors have fallen out "and I'm waiting for new adult teeth to push through my gums." June says," I have four canine teeth, "but I only have four incisors "because some were taken out by the dentist " to allow more room for my other teeth to grow." That's very true, Jun.

Yeah, I had this when I was younger as well.

My teeth were clustering up in my mouth, so the dentist had to remove a couple of teeth just to allow some more space for things to grow.

You might have had a similar thing as well, so I wonder what kind of things you found when you were exploring in your mouths.

Let's summarise our lesson, types of teeth.

Teeth can be observed in the mouth using a mirror.

Dentists and dental hygienists use special mirrors to observe teeth more closely.

At the front of the jaw, incisor teeth look flat and smooth.

Near the front of the jaw, canine teeth look sharp and pointed.

At the back of the jaw, molar teeth look wide, flat but bumpy.

Now that you know the names of some of the different types of teeth and what they look like, have a little think about the types of jobs that they do.

Do you use them all to chew food or cut food? Hmm, I wonder what they could be useful for.

I hope you've enjoyed poking around in your mouth and having a good look.

I'm your Mr. Wilshire, thank you very much for listening.