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Why Do We Have Such Crooked Teeth?



A lot of humans need or want braces to fix their crooked teeth, but why do you never see a dog walking down the street with headgear? Our ancient ancestors and mac and cheese may be to blame!

*Correction: Even though hyraxes look similar to rodents, they're actually in the order Hyracoidea, not Rodentia! They're more closely related to elephants and manatees than to mice and guinea pigs.*

Hosted by: Hank Green
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Sources:
https://www.wired.com/2011/11/agriculture-jaw-shape/
http://www.pnas.org/content/108/49/19546
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0117301
https://www.ncbi.nlm.nih.gov/pubmed/19514263
http://www.sciencedirect.com/science/article/pii/S004724840400051X
http://rspb.royalsocietypublishing.org/content/early/2011/06/07/rspb.2011.0971


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Comments:

Author watts300 ( ago)
Completely off-topic, but a still a tangent from the video -- do other cultures in the world (eastern Asia included) also enjoy macaroni and cheese as much as we Americans do?

Author Gunjan Chati ( ago)
why are my teeth above jaw line? can it be fixed(above another teeth)

Author Nemo Fil ( ago)
first of all, human jaws shrank way before the agriculture revolution happened thanks to fire and cooking meat, which allowed the the brain to get bigger in expence of the jaws. agriculture may have further shrank jaws a little bit.
but more importantly, hyraxes aren't rodent!!!! from all people i expected you hank to know this!

Author Geflügel HNZ ( ago)
Especially if it got maggot cheese!

Author Peter mG ( ago)
Mac n cheese is like soup to me

Author coolsarahkry1 ( ago)
I love your shirt. It's...hypnotizing...

Author Chapter Eleven ( ago)
so i want to get braces, cause my teeth are all messed up. or invisiline. something to fix em, yknow? but i dont want to do that until my wisdom teeth come in, since i dont wanna spend a bunch of money to get braces then have my wisdom teeth come in and fuck them all up again.
however, as far as i know, my wisdom teeth could take until im 27 to come in (thats how old my mom was when hers came in; my dad got his cut out quite painfully before they came in). if i even have wisdom teeth. do I have wisdom teeth? who knows. I havent been to a dentist in years, either.
...my teeth deserve a better host.

Author iicharliieii 2142 ( ago)
My teeth are strange, they're straight (I've never needed braces) but they're misaligned.
My canine hangs over the first premolar one one side, and the other hangs halfway between the lower canine and first premolar.
And some of my teeth can't touch their counterpart or whatever's directly below.
It doesn't feel right, but it's never caused me problems...

Author David Salley ( ago)
Your videos are very interesting, but I have and 8 AM class, so I need to go to sleep so I can work on homework for another class during that time.

Author Courtney Courteau ( ago)
I could've gotten braces but I chose not to.

Author Sanjuan Guestsr ( ago)
Hank's the best

Author Feynstein 100 ( ago)
My canines are slightly bigger than the rest of my teeth. Was I meant to be a vampire?

Author IsaacSnider DoesThisOneThing ( ago)
Wow that shirt

Author eustagoesout ( ago)
blame it on the weather

Author M Jenci ( ago)
I have no wisdom teeth and in addition to that are missing three adult teeth, I still have 3 baby teeth past my 20's.... My dentist say's I'm lucky I'm missing so many teeth because my jaw is super small and they wouldn't have fit anyway, just have to be careful because those baby teeth aren't meant to last a lifetime.

Author MrAstronomer 22 ( ago)
Please do a video on TMJ and Teeth grinding.

Author JBTechCon ( ago)
It's actually miscegenation. If you cross-breed an ethnicity with big teeth to an ethnicity with small mouths, you get kids with crowded mouths. Same reason there are so many C-sections.

Author TomatoHeadGaming ­ ( ago)
why was I born without wisdom teeth (and also missing my upper canines)

Author Anujan Kirupakaran ( ago)
I'm hoping I don't get braces coz my younger sister has them and they look painful

Author TheMonsterAbyss ( ago)
Lol, i was searching for Papa Roach's song and I find this...

Author Rebecca Lopez ( ago)
Pics would have been nice but I still learned a lot

Author crossfire367 ( ago)
I'm pretty sure Dentists aren't all that woeful when they get to bill us for all the braces work....

Author gigantkranion ( ago)
"It's hard to test directly in humans though, because that would mean limiting what people could eat for a huge chuck of their lives."

"Chewing your foods forever till your teeth break"

Umm... Chewing gum?

Preferably, a really tough kind.

Author Damian the Phoenix ( ago)
Damnit, Hank....now I have a craving for mac and cheese

Author NintendoPolitics ( ago)
I always wondered why humans are the only creature that cannot drink directly from the water source...why do we have to clean our water to drink it?

Author Hortonius Imperialus ( ago)
uh, but it can be demonstrated in humans.. Do you know how archaeologists can identify bones of archers, esp from medieval times, and English long-bowmen in particular? Or how they can identify those bones belonging to a viking seafarer? it has to do with their professions and how their bones responded to stress

Author ccggenius12 ( ago)
So, if I raise my kid on a diet of beef jerky and raw vegetables, I'll be less likely to need to drop cash for braces?

Author MinecraftCats Cat ( ago)
I hate braces no one likes them, I have braces them WHAT NO MAC AND CHEESE that's what they SAY TO EAT DUMBO

Author Socks, shoes, and hats ( ago)
Wait... aren't hyraxes related to elephants and manatees, not rabbits and rodents?

Author atlastpeace ( ago)
I got braces out of vanity. However, it did give me a few health benefits: easier flossing and brushing, also it's impossible to bite my nails now.

Author Fern Moore ( ago)
So does that mean we should be making our kids eat raw food until their mouths are fully formed? Then we won't have to pay for expensive dentistry. lol

Author Johey Jonsson ( ago)
My teeth are the product of some very fortunate genetics. Apart from one tooth I damaged when I ran my bike into a lamp post and one tooth I damaged by breaking it on a stroller at 11 months, making the second tooth come in slightly tilted, all my teeth are straight. Not even my wisdom teeth came in crooked, which in itself is a miracle.

Author Adam Xyz ( ago)
The real reason you're teeth are Crooked is because your jaws aren't developing properly. This means your jaw is too small for what it is supposed to be. This means your mouth posture is wrong. The good mouth posture requires your tongue to be pressed up to the roof of your mouth at all times when not eating in order for your jaw to develop properly from the tongue pressure.

Look up Dr Mike Mew

Author yoyomomishungryz ( ago)
Some dogs have crooked teeth

Author SPACKlick ( ago)
Hyraxes aren't rodents, they're the closest living cousin to the thethytherians (Elephant, manatee and dugong). Very different beasties than rodents.

Author funmbimoti ( ago)
speak for y'all selves....my teeth are perfectly straight.....

Author Frank Tufano ( ago)
Its not solely agriculture; they are plenty of people born with straight teeth in our generation. If you look at Weston A. Prices research on dental caries there were civilizations less than 100 years ago with jaws wide enough to accommodate teeth. The singer Pia Mia is a good example of someone with this jaw.

How can you say mastication has anything to do with bone and jaw development when babies were breastfed and our ancestors, at least during development periods, did not eat foods that required any more chewing now.

I know for certain being breast fed over formula fed plays a huge factor. You can also argue from that point of view that nutrient consumption of the mother during pre natal periods is important. Nutrient intake during early childhood into teenage years also plays a role but not nearly as much as the former.

Author Rin Tohsaka ( ago)
My teeth are straight. I get asked whether or not I have have braces before, but I never did. My jaw just got wider as I got older.

Author Angel Diaz ( ago)
i never had crooked teeth. never needed braces. #blessed

Author Melissa Nehr ( ago)
Removed my wisdom teeth under the belief it would prevent my crowding. It didn't =_= adult braces anyone?

Author Bendy the Dancing demon ( ago)
......

Author Casey Monaghan ( ago)
but steak is really chewy...

Author stay safe ( ago)
Improper oral posture is a big culprit.

Teeth together and tongue on the roof of the mouth. Mike Mew has talked about this a lot.

Author Chris East ( ago)
There is a breakthrough in orthodontics called Orthotropics, the Man behind it Dr Mike Mew has some very convincing evidence that a big factor in crowded teeth and under developed jaws may be due to not only a soft diet but also the position of the tongue in the mouth and swallowing habits as well as mouth breathing. I would LOVE to see Sci show do something with him hes an amazing guy.

Author Cameron Johnson ( ago)
I feel bad for most people, i've never had any problems with teeth. all mine are straight and "perfect" fitting

Author Lovell Mills ( ago)
Who else is here because they have Braces!?

Author ASSASSYN ( ago)
What the fuck do you mean by, "we?"

Author TheJamesRedwood ( ago)
Vitamin K2
My teeth fit perfectly, never had any constructive surgery. As you said hunter-gatherers - who have a diet high in K2 - don't have this problem.

Author cookie22100 ( ago)
This theory is weird though because I have a small mouth and jaw and my teeth ended up being naturally straight.

Author ThatOne Dude ( ago)
bitches be saying crookit

Author Koshunae ( ago)
I don't really have crooked teeth, I have a couple that are turned ever so slightly outwards. Other than that my teeth are straight and I think I could have grown my wisdom teeth normally however one of my molars developed an abscess when I was 16 and when that happened, they cut the molar out, along with my wisdoms which were developing sideways anyway. Oh and I still have a baby canine because the adult tooth grew sideways in my gums for some dumb reason. Can't see it or feel it physically, but in x-rays, there it is, all sideways.

Author Shadowfudge ( ago)
*me: casually sits here watching this video while having no need for braces cause my teeth are perfectly straight*

Author benox50 ( ago)
Humans have micro jaw and nose cause short front but huge back for huge brain

Author The Astoni ( ago)
*most people* "Ah, I have too many teeth and not enough space!"
*me* "Ah, I have four extra teeth. They are all practically straight and I have plenty of space, but I'm still getting them pulled out of my face."

Author ParkourMatt ( ago)
That first picture is not a beaver, it has red teeth therefor its nutria

Author Kevin M ( ago)
Never had braces, my teeth aren't crooked, I have all my wisdom teeth. All I do is brush my teeth twice a day. Then again, I am applying to dental school in June though.

Author billy persistent ( ago)
A better question is why does anyone want their teeth so straight.

Author Jason Doss ( ago)
So, if I'm hearing this correctly, evolution was smart enough to recognize the lack of need for a more spacious jawbone, but it wasn't smart enough to adjust the number/size of the teeth to accommodate the new jawbone blueprint. Yeah, ok. That's like saying you're going to downsize your log cabin, but you refuse to use fewer logs.

Author Kevin Cole ( ago)
EHH HEM SORRY But hyraxes are *not* rodents as you guys noted. They are under the Order Hyracoidea, not Rodentia like actual rodents. Being in the Superorder Afrotheria, Hyraxes are actually more closely related to elephants and manatees than anything else. Entirely different than rodents like rats and beavers, etc.

*The more you know*

Author AirCooledMan2006 ( ago)
HYRAXES AREN'T FUCKING RODENTS! They're more closely related to ELEPHANTS than to any rodent! Hyraxes, elephants, elephants, and manatees are AFROTHERIAN mammals. Rodents are EUARCHONTIGLIRES. WE'RE more closely related to rodents than hyraxes are! FAIL!

Author Ameya Thatte ( ago)
hyraxes aren't rodents. They are actually related to elephants, sea cows and aardvarks

Author Bob Fitch ( ago)
One of my kids was born with only two wisdom teeth instead of four, and the other kid was born with no wisdom teeth at all. I tell them they are advanced humans... the next step in our evolution. :)

Author Lockon Stratos ( ago)
I want to be a farmer now

Author AE ZHIVΛ ( ago)
Look up orthotropic treatment.

Author Shanay#1 xD ( ago)
I'm 14 and haven't had my wisdom teeth yet and my teeth r perfectly straight except I have one gap between my top two front teeth

Author mayank shukla ( ago)
why are reproductive organs positioned between the legs?

Author SquirrelCraftYT ( ago)
I have two rows of teeth

Author DemonVO ( ago)
don't even dare to tell the truth: human races interbreeding

Author cobainzlady ( ago)
That's dumb. Just read a few books on nutrition, the natural diet of indigenous tribes in nature for example, vs "modern civilized" diet. The natural tribes have better teeth and facial bones, and less rot. THE DIFFERENCE IS THE FAILURE TO EAT THE WIDE RANGE OF NATURAL AND WILD GROWN FOODS, nowadays, for most of us. And also not getting enough outdoor time in the warm sun for vitamin D formation. Several researchers have found out why, and how to fix it. Eat more like people did a couple hundred years ago. Even Americans had better teeth then, if they lived on farms and drank/ ate good raw organic dairy products and other foods.
This difference in diet was also found out a century ago by a traveling researcher dentist, who wrote a book. He compared the diets and facial bone / tooth formation of people who used to eat their natural tribal diet, then changed to 'WHITE MAN WHITE BREAD " ASSININE DIET. The next generation after this change, the people looked like white people, whit crooked (rather CROWDED) teeth and lots of tooth rot just like us.
EAT MORE WILD AND ORGANIC FOODS AND LEARN MORE ABOUT NUTRITION PEOPLE!

Author JesseLH88 ( ago)
I think Caitlin Hofmeister should have done this story if ya know what i mean.

Author ndgo ( ago)
Okay I know this sounds stupid but I have chewed on pencils my whole educational life. (About to graduate high school) and I have the straightest teeth of anyone I know and I've never had braces. Coincidence? I THINK NOT!

Author n40798 ( ago)
I never had wisdoms but my teeth still ended up crocked:(

Author Bdg1991 ( ago)
This really doesn't answer why some people have straight teeth from the get go. My teeth are straighter than anyone else in my family and I'm the only one without braces.

Author Sotiris Krol ( ago)
A British conspiracy to give everyone shit dental hygiene.

Author Rob Kinney ( ago)
So, short answer = Wolff's Law?

Author Joseph Ang ( ago)
I have good teeth, I ate coconut while I grew up.

Author JorgCAlexander ( ago)
This makes me wonder if there is a relationship between having relatively straight teeth and the consumption of raw vegetables like carrots. Like how much do you need to eat those in order to have an impact on jaw development. Could doctor's potentially recommend minimum amounts of tough foods for developing children to eat that promote orthodontically helpful jaw development while keeping in the softer processed foods for all the benefits they provide.

Author The Socially Awkward Otaku Girl ( ago)
If only this video were/was 2 seconds longer... sigh...

Author Easy Bake Ovens! ( ago)
I've never had braces, yet my teeth are straighter than most people who've had them..






anyone care to explain? lol

Author fung whyou ( ago)
So moms horrid cooking was actually the way its supposed to be

Author Raen 304 ( ago)
heres a question. why do some people not have any wisdom teeth? my ex didnt have any, and a few friends i have only have the upper or lower wisdom teeth. why is that?

Author Vince ( ago)
Another reason as of late, is that we are living more stressful lives than we used to and that can lead to teeth grinding and/or clenching while you sleep. The constant pressure lends to shifting of teeth.

Author Anonymous Prhofet ( ago)
Everyone is getting porcelain teeth😷😬

Author Anonymous Prhofet ( ago)
Parents don't give kids pacifiers or bottles, just give them titi milk. Lolz

Author Chayrsone ( ago)
What about chewing gum? Does that affect childhood development in a similar way?

Author Don Trump ( ago)
Why does Hillary have such crooked everything

Author Nicholas ( ago)
raise your child to be hardcore by only feeding them things tough as nails

Author Alex G ( ago)
Cuz my parents had no moniez :(

Author Klay Z ( ago)
I had straight teeth until the age of 7 then my new teeth came in with 3 gaps in front ,they're straight now but why did they have gaps

Author Kazoobird ( ago)
HYRAXES ARE NOT RODENTS FFS!!!! THEY ARE DISTANTLY RELATED TO ELEPHANTS! GET YOUR FACTS STRAIGHT!

Author Howard ( ago)
I'm so fucking grateful that my teeth are naturally straight, can't even imagine the annoyance of braces

Author wwgeb ( ago)
According to Weston Price we have crooked teeth due to our lack of fat soluble vitamins A, D, and K2. Read the book Vitamin K2 and the Calcium Paradox: How a Little-Known Vitamin Could Save Your Life

Author Jessie1Dx ( ago)
Everyone always thinks I had braces but my teeth are naturally really straight don't have any wisdom teeth though I have 28 teeth instead of 32

Author Derek Gaming ( ago)
Got braces today they are a pain in the mouth

Author Government Agent ( ago)
agriculture fucked everything up.....now we are weaker, and alot stupider.

Author JamesBondUS Minecraft ( ago)
Asian all have like 90% straight teeth 😂😂😂

Author Yason You ( ago)
god I despise having crooked teeth. I like to smile, but lack confidence to do so.

Author KindaXP ( ago)
does that mean modern society has impeded my potential for a strong sharp jawline?

Author Ladyhawk Misses Gabby ( ago)
Hyraxes aren't rodents. Their closest relatives are elephants.

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