Name: 知らなかった～歯磨き粉の秘密 (I Didn't Know That - Secrets of Toothpaste)
Uploaded: 2021-01-14T05:03:41.000Z
Duration: 3 min 29 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

The average UK citizen will brush their teeth over 40,000 times in a lifetime

using a staggering 80 liters of toothpaste.

And such a routine parts of our everyday lives,

but there is only I think about it is when it runs out.

Now that’s a shame because toothpaste is fascinating stuff.

Tooth care remedies have been around for thousands of years.

The world’s oldest surviving formula is Egyptian

and it was made from mint, flowers, salt and pepper.

It dates to the 5th century AD and by all accounts it worked very well.

Although it did have the nasty side effects of making your gums bleed.

Having said that, it was far less hazardous than some 20th century brands.

In the 2nd world war, German scientists from the nuclear industry

developed a radioactive toothpaste with thorium for the domestic home market.

It cleans. It kills germs. It’s radioactive.

Say thorium wasn’t a great idea but other additives were much more successful.

In 1901, a dentist in Colorado Springs noticed that locals had far fewer cavities than was the norm.

The reason was eventually tracked down to high natural levels of fluoride in the water.

From this basic observation, fluoride quickly became the dental one additive of choice.

Well the number one ingredient is something abrasive.

You know something to scrub the pearly whites

For this, toothpaste manufacturers typically use baking soda or chalk or even silica which is a refined type of sand

and many add whitener, flavouring, something to make it foam.

Something to bind it all together and finally fluoride.

Now did you know you can make your own toothpaste out of simple household ingredients?

For this recipe, all you need to do is mix three tablespoons of baking soda with 1 tablespoon of salt.

Mix them all together with a dash of water.

And finally add 1 teaspoon of peppermint and hey presto!

I’m going to stain my teeth with licorice.

Now my teeth feel awful so let’s put this home-made toothpaste to the test.

I feel that! Gosh! Seriously, feel good. I feel much better.

It’s incredibly salty but it’s cleaning my teeth.

How about my teeth looks a little bit cleaner?

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知らなかった～歯磨き粉の秘密 (I Didn't Know That - Secrets of Toothpaste)

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