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I am still in the Arctic, so today’s guest
video comes from Chase at ScienceC,

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who sent in the best pitch out of all the
150 that I got.

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And it started, “hi Tom,

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I’ve got two of my sister’s teeth dissolving
in soda”.

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I have a confession to make.

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I love Mountain Dew.

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I think my weather balloon video alone probably
took a few 12-packs.

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Mountain Dew isn’t exactly known to be the
healthiest beverage out there.

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So today, I’m going to do a little experiment
to see just how bad Mountain Dew is for your

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teeth.

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So right here, I have two of my sister’s
molars.

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I’m going to be soaking them in both a bottle
of Mountain Dew,

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and a bottle of Coca-Cola for the next three
weeks.

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So let’s see what happens!

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These teeth have been soaking in the soda
for two weeks and five days.

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Before we take them out and weigh them,

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let’s get a little background on this soda.

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So the Mountain Dew right here has a pH of
around 3.1

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whereas the Coca-Cola has a pH of 2.5

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making it six times more acidic than the Mountain
Dew.

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So let’s take these teeth out, and see how
much their mass has changed.

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I’m going to pour the Mountain Dew out here,
and get the tooth out…

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I got the tooth out, and as you can see, it
looks a lot more yellower,

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especially at the base of it, than before.

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Whoa, whoa, whoa...

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This tooth does not look very good at all.

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It is all black around the crown,

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and it just looks disgusting and nasty.

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So I’m going to clean it up with a little
bit of water.

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So now that I’ve gotten these teeth dried
off, if you look really closely,

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you can actually see that a lot of the enamel
that was there

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— the white stuff — is gone where it previously
was before.

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And on the Coca-Cola tooth, you can’t really
see a whole lot,

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because it’s so stained.

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Now the teeth are sufficiently dried off,
let’s weigh them.

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So the Coca-Cola tooth weighs .80 g,

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meaning that it’s .06 g lighter than it
was before.

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Now, if you look at the Mountain Dew tooth,
we can see that it is .81 g,

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meaning that it is 13 hundredths of a gram
lighter than it was before.

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Now if we adjust for the initial mass of the
teeth,

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we can see that the Mountain Dew tooth lost
14% of its mass,

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while the Coca-Cola tooth only lost 7% of
its mass.

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Half of what the Mountain Dew lost.

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Since Coca-Cola is six times more acidic than
Mountain Dew,

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you would expect it to have a higher decay
rate than Mountain Dew.

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This is not the case for two factors.

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And that first factor is titratable acidity,
or TA.

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So pH is a measure of the level of acidity.

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That means that Coca-Cola is more acidic than
Mountain Dew.

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However, Mountain Dew has a higher titratable
acidity than Coca-Cola.

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Meaning that it has more acid than Coca-Cola.

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This means that it takes longer for the saliva
in your mouth to dilute that acid

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than it would for most cola drinks.

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In addition to this,

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it’s also the type of acid that’s added
that makes the difference.

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So Mountain Dew, just like most non-cola beverages,

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has citric acid added into it.

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And citric acid is an organic acid,

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meaning that it will be able to break down
the calcium in your teeth

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faster than inorganic acids like the phosphoric
acid found in most cola beverages.

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This ultimately means that Mountain Dew is
worse for your teeth than Coca-Cola,

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even though Coca-Cola is way more acidic

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and that’s something that you might not
have known.

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Thanks, Tom.

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Thanks, Chase!

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Thought I’d left that catchphrase behind.

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Go subscribe to his channel, he’s got some
wonderful videos coming up,

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links on screen or in the description now.

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Let’s face it,

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he’s going to have my job in 5 or 10 years’
time, you’re getting in early.

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Next time, we have, well, a very familiar
part of China.