Hello scientists, my name is Mr. Wilshire.

And in this lesson, we're going to be looking at different teeth for different foods.

Let's take a bite out of this lesson.

The outcome for our lesson today is to identify which teeth are used to eat different types of food.

There are some key words for us to look through before we start our lesson.

The first word here is identify.

The next word is teeth.

Then we have functions.

Now, it's omnivore.

And last of all, classify.

I wonder if you know the definitions behind any of those words already.

You may have come across a few of these before.

Now, if you're not too sure what some of them mean, take a little look at the definitions coming up on the screen now.

If you want to, you can pause the video here, and have a little read to remind yourself.

But don't worry though, the meaning of them should be become clear as we progress through the lesson.

Pause the video here if you want and have a read, restart when you're ready.

The first nibble we'll take for this lesson is called different teeth for different foods.

Let's jump in.

Now, Andeep here wants to be a dentist when he grows up.

Lots of you might decide that you want to be a dentist as well.

It's a very useful job to do, isn't it? You can help people make sure that their mouths are always clean, and advise them on the best way to keep healthy.

I wonder if you can help him to identify and describe some different teeth here.

Pause the video now and have a quick discussion.

What are the names of some teeth that you know? And what are the jobs that they do? Restart when you've done that.

Hopefully you've had a good chance to discuss some of the different teeth that you know, to remind yourself.

Now, as we go through the names of some different teeth, I'm going to show a little purple box around some teeth and I'd like you to tell me which ones they are.

I'll give you five seconds to shout out your answer.

You ready? The first set are here.

Did you say molars? Molars are wide, flat, and bumpy.

They're found at the very back of the jaw, just all the way in there at the back.

I wonder if you can remember the job that molars do.

We'll have a little look on the next slide.

Next up, what are these teeth? I wonder if you said incisors.

Now, incisors are flat, smooth, and almost rectangular in shape.

They're found at the very front of the jaw, just these ones here.

Next up, these teeth.

I wonder if you said canines.

Canines are the pointy ones just to the side of the incisors.

There they're found to the left and the right of the centre of the jaw.

Now, I wonder if you can feel these different types of teeth before we move on with your tongue.

Take your tongue and roll it around your mouth.

See if you can find the incisors, the canines, and the molars.

Restart when you've done that.

Hmm.

Now that you've had a good feel around your mouth with your tongue, let's go through the reasons that some of these teeth are different shapes and sizes.

Now, they're shaped differently because they all have different functions.

I wonder if you can remember any of these.

The function of the molars are to grind up and chew some food.

Remember they're great, big cube sort of shaped teeth at the very back of your mouth.

Next up, the incisors.

The function of the incisors are to bite and cut the food.

They're at the very front of your mouth here, so as food goes in, they're there to chop it straight up into smaller bite-sized chunks.

Last of all, we have the canines, and the function of these teeth is to rip and tear.

The canines are sharp and pointy, so they can jab into the food and rip and tear it apart.

Okay, future dentists, let's see if you can match the teeth up to the correct description of its shape and function.

Here we've got a picture of a large cube sort of shaped tooth.

Its very flat at the top and it's very, very big.

Then underneath there, there's some rectangular shaped sort of teeth, and at the bottom there, there's a much pointier tooth as well.

Take a moment to discuss what you can see.

See if you can remember some of the functions of these teeth.

Restart when you've done that.

Let's see how you got on.

The top picture there is a picture of the molars.

Now, the molars are wide, flat, and bumpy, and their function is to grind up the food.

Underneath that, we have the incisors.

They're flat and smooth and rectangular in shape, and they're there to cut the food up.

At the very bottom, it's the canine teeth.

Remember, canine teeth are named after dog's teeth.

They're sharp and pointy, they are there to rip and tear food.

Now, different people have different diets, and this means that they might not eat certain types of food.

Izzy here, she says, "I'm a vegetarian, so I only eat food from plants, like fruit, vegetables, seeds, and nuts." "I am a herbivore," she says.

Ah, a herbivore is somebody who only eats plant-based food, of course.

Whereas Jacob over here, he says, "I eat food from plants, like vegetables, and meat from animals, so I am an omnivore." Oh, of course, that means he eats both types of things, doesn't he? He doesn't just limit himself to one type of food.

He likes to eat everything, he's known as an omnivore.

Have a think now and think about your diet, what type of diet do you eat? Are you a herbivore or are you an omnivore? Take a moment to discuss with a partner.

Hopefully you've had a good chance to have a think, or discuss with somebody nearby.

I wonder what you are.

Are you herbivore or an omnivore? I think I'm definitely an omnivore.

I do like to eat a salad with meat that I eat, so I like to eat a mixture of everything.

Now, Sofia and Andeep here are talking about how the diet that they eat might affect the teeth we need to use when we eat.

Sofia says, "When we use our canines to rip and tear food, we are mostly eating meat." Andeep says, "I don't eat meat, so does that mean that I don't need my canine teeth?" Well, what do you think? Take a moment to stop and think.

Restart when you've done that.

So, what do you think? Do you think you need canine teeth if you're not ripping into meat? Hmm, let's find out more.

Sofia's big sister here explains more about why humans have different types of teeth.

There's Sofia's sister there, ready to give us a reason.

She says "Most humans are omnivores." "Over thousands of years, humans have developed the right type of teeth to eat food from both plants and animals." So even if you don't eat meat, you'll still use different types of teeth to eat different types of food.

Hmm, well, if you're not eating meat and you're using your canine teeth, I wonder what they can be used for then.

Andeep and Sofia identify then which teeth they used to eat in their last meal, to see if her sister is right.

Andeep says, "I ate some celery sticks." I needed my canines and my incisors to tear a piece off, and then my molars to grind it all down before I swallowed it." That's right, isn't it? If you're eating something a lot harder, like celery, you are going to need to bite into it, and rip and tear it apart.

Sofia says, "I ate some fish fingers." "I needed my incisors to bite a piece off, and then my molars to chew it before I swallowed it." Fish fingers are quite soft, aren't they? So they don't really need to be torn up by the canines.

Hmm, so Sofia, as an omnivore here, has just used her in sizes and molars, whereas Andeep has needed to use all of his teeth to eat the vegetables.

Let's stop and think.

Humans are mostly omnivores, and have different types of teeth for eating.

Read these statements and have a discussion.

Which one is correct? Restart when you've done that.

The answer here is, C, food from plants and animals.

Omnivores eat both, don't they? Let's think about these statements.

Who do we think is correct? Izzy says, "I don't like eating vegetables, so I don't need molar teeth." And deep says, "I am a herbivore, so I only need molar teeth to eat my food." Sofia says, "Humans need molars, canines, and incisors for eating different types of food." Have a discussion and decide, who do you think is correct? Restart the video when you've done that.

The correct person here is Sofia.

She's right, isn't she? Humans need all of their teeth to eat different types of food.

So here is task A.

You need to draw or take a photo of a meal for Andeep, who is a herbivore, and a meal for Sofia, who is an omnivore.

There's an example picture of a meal there.

Label each type of food on the plate, and identify which teeth they would use to eat it.

Remember, you may need to use more than one teeth type in order to eat some food.

Which ones are you going to use? Now, have a think about this question.

Do both children use each type of teeth to eat their meals? Good luck with that task.

Restart when you've done that.

Now that you've had a chance to discuss and complete that task, have a little look at these answers.

Your answers may be similar to this.

I chose a vegan pad Thai for Andeep.

He would need to use all of his different types of teeth to eat this meal.

Here, you can see canines are going to need to be used to rip and tear bits off the raw spring onion.

The the molars are needed to chew and grind down the noodles, the spring onion, and the soya pieces before swallowing.

And the incisors and canines at the front there, they are going to need to bite and tear noodles into smaller pieces.

The omnivore plate though is going to be different.

I chose some chicken tacos for Sofia.

She is going to need to use all of her different types of teeth to eat this meal.

Incisors and canines will be needed to bite and tear the taco and chicken pieces.

The molars then are going to chew and grind the onions, the lettuce, and the chicken pieces to break them all down.

Hopefully you've had a good chance to discuss some different types of delicious meals, and decide how an omnivore or how a herbivore are going to tackle them.

Hopefully you can see that they're going to need to use all of the teeth in their mouth to tackle all of the food on that plate there.

Well done, everybody.

Great investigating.

The final part of our lesson is called investigating teeth.

Andeep wants to identify which teeth we use to eat lots of different types of food.

I wonder if you can help him here.

Which teeth do you think you would use here for a carrot, a smoothie, some grapes, crisps, a sandwich, a cracker, and some lettuce? Would you use more than one type of teeth for any of these foods? Pause the video here and have a discussion, restart when you've done that.

Let's go through some of these different types of food, and the teeth that we're going to need in order to eat them.

Andeep says, "I tried different foods and found out that I often use more than one type of teeth for different functions to eat the same food." "I used my canines to tear a piece of lettuce, and then my molars to grind it down into small pieces so I could swallow it." You can see there the lettuce that Andeep has had to chew.

So, different teeth can be used to eat the same food.

How might you use incisors, canines, and molars for different functions When you eat a sandwich? Have a quick discussion and restart when you've done that.

Hmm, well, first of all, your incisors are going to need to cut into the bread and anything else on the inside of the sandwich there.

Then your canines are going to need to rip the bread apart and break it all down, ready for the molars at the back to chew it all up into swallowable pieces.

Some food though can be blended into a smoothie.

You're not going to need any teeth to eat this, are you? So let's stop and think.

Which of these foods are you likely to need different types of teeth to eat? Is it jelly, celery stick, or a sandwich? The answer here is a celery stick and a sandwich.

The celery stick, you're going to need to chop it up using the front teeth and your molars to grind it up.

The sandwich, you're going to need to use all of your teeth to chop it up and mush it up into something that you can swallow.

Andeep wants to sort different foods into groups, according to the teeth that we use to eat them.

Scientists will observe and compare things before sorting them into groups, this is called classifying.

You can see these objects have been classified using sorting hoops, like see-through and not see-through materials, and mammals and non-mammals there.

I wonder if you can think of any ways that you can sort things.

Now, we can also use a Venn diagram to classify things that have features of both groups.

Here's a Venn diagram.

Now these things here are grouped together in hoop A because, well, they're all blue.

And these things are grouped together here in group B because they are all red.

So what's gonna go in the middle? Ah, there it is.

That object is in hoop C because it is red and blue.

So you can see how those two circles join together, and the middle part there is a mixture of all of them.

Now, Andeep creates a Venn diagram of his own to classify which teeth he used to eat his evening meal.

This group here contains food that only the incisors and canines are used for, and then this group contains food that only the molars were used for.

This group contains food that all the teeth were used for.

So here are some diced carrots and raspberries, and here are crusty bread and some corn.

I wonder if you can think of anything else that could go in the next section there.

What does the Venn diagram tell you about which teeth Andeep uses for different foods? Pause the video and have a quick discussion.

Hopefully you've had a chance to discuss what you think.

Let's go through some answers.

Some foods, like diced carrots and raspberries, are only ground down by molars.

Other foods, like crusty bread and corn on the cob here, they need each type of teeth to help to break it down.

Now, Andeep didn't classify any food that only needed canines and incisors to eat them.

Pretty much everything needed the molars at the back to mulch it all down into something that they could swallow.

So with all that knowledge in mind, let's stop and think.

If a scientist wanted to classify objects, which of these ways of recording might they use? A bar graph, some sorting hoops, or a Venn diagram? The answer here is a Venn diagram and sorting hoops.

Sorting hoops kind of looks like a Venn diagram anyway, doesn't it? So, here's a final task for this lesson.

Using all of the knowledge that you've gained and all of the discussions that you've had, you can hopefully come up with some answers here.

So, make a list of all the food that you've eaten today.

Think about the types of teeth that you used to classify the food on your list using a Venn diagram.

So here you can see, there's the Venn diagram from earlier, and there's incisors and canines on one side, molars only on the other side, and in the middle are all the teeth.

Hmm, have a think about the types of food that you've eaten, and start to classify using the Venn diagram.

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

Hopefully you've had a chance to have a think about all the food that you've eaten and you've then classified it.

Here are some of the food that I've eaten today.

Let's have a little look through, your answers might be similar to mine.

Now, I only use my molars to chew the grapes and the very small bits of fruit that I found in the smoothie.

I like a smoothie that's quite lumpy and chunky.

I used my molars, canines, and incisors to tear bites and grind the lettuce, carrot, and crackers.

There wasn't any food that I could think of that I needed to use my incisors and canines.

Well done for your investigating today, everybody.

Let's move on to summarise our lesson.

Now, different types of teeth are shaped differently for different functions.

Humans are mostly omnivores and therefore, they have different types of teeth for eating food from animals and plants.

Different types of teeth can be used to eat the same piece of food.

Food can be classified according to which teeth are used during eating.

With all of the knowledge today, hopefully in the future, you might have an excellent career in being a dentist.

Or maybe a dietitian, someone who is there to help advise people on the types of food that they need to eat.

If you know about the teeth that you're using in your mouth as well, that's gonna come in really useful, isn't it? Whatever you get up to in the future, best of luck scientists, and see you soon.

I be Mr. Wilshire.

Thank you very much for listening.