Why Do We Have Such Crooked Teeth?

  • Опубликовано: 11 мар 2017
  • 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:
    www.wired.com/2011/11/agriculture-jaw-shape/
    www.pnas.org/content/108/49/19546
    journals.plos.org/plosone/article?id=10.1371/journal.pone.0117301
    www.ncbi.nlm.nih.gov/pubmed/19514263
    www.sciencedirect.com/science/article/pii/S004724840400051X
    rspb.royalsocietypublishing.org/content/early/2011/06/07/rspb.2011.0971
  • Длительность: 2:58
  • SciShow  science  Hank  Green  education  learn  teeth  hunter  gatherer  hunter-gatherer  human  biology  braces  animation  agriculture  early man  anthropology  skull  bone  food  cooking  dentist  jaw  chewing  evolution  genetics  development  developmental plasticity  pasta  meat  macaroni and cheese  vegetable  beaver  

Комментарии: 1 627

  • Ellie Griesemer
    Ellie Griesemer 2 дня назад

    Why is it that some of my adult teeth never developed?

  • Asher Now
    Asher Now 6 дней назад

    I can't afford braces

  • It's yuh girl mikkeai8908
    It's yuh girl mikkeai8908 8 дней назад

    I wonder if genetics play a role because pretty much everyone in my family naturally has straight teeth. None of us have ever had braces but we pretty much all have straight teeth still.

  • Don Wald
    Don Wald 9 дней назад

    I was too poor to get braces.

  • Kaitlyn Munday
    Kaitlyn Munday 9 дней назад

    Being in the dental practice I have some skepticism behind the blanketing statement that our jaws simply aren't big enough anymore. Most African descended people have ample room in their arches for all 32 teeth, often with a central diastema. Polynesian people also often exhibit this, though not as commonly. Where in my experiences it is most often asiatic (specifically Chinese in my practice) and Caucasians that either have to have them removed or never develop them. These two broad groups of people in my experience are the ones who need between 2-8 teeth removed for orthodontic treatment. As the video stated we tend not to see maloccluded teeth in nature. This is a result of rich genetic diversity. When genetic diversity is limited due to factors such as isolation and breeding we see this readily in many animal groups, take the family friend the English bull dog as an extreme example.
    Now I ask myself this is this, is this topic of malocclusion and wisdom teeth removal (or having none at all) an evolutionary leap, something that is beneficial to the human genome as a result of agriculture, or a result in loss of genetic information due to how our ancestors got jiggy with it?
    I Kate the causian lean toward the side of dwindling genetic diversity.

    • Kaitlyn Munday
      Kaitlyn Munday 9 дней назад

      https://youtu.be/qGlwiVDTZjw
      A link to an informative video. It touches on the point about 10000 years of agriculture made here. The video in the link suggests that only in the last 400 years have crooked teeth -in the modern sense- been noted in humans.

  • IntarwebUser
    IntarwebUser 9 дней назад

    So... how many carrots and apples do I have to feed my kids and for how long to keep them from getting crooked teeth? What about chew toys, are there any chew toys for humans and how well would those work? I've had braces, and I've had wisdom teeth removed, and I'd prefer that weren't necessary for my descendants. And if genetics isn't the problem, then marrying a man with straight teeth isn't going to solve it.

  • fuckfannyfiddlefart
    fuckfannyfiddlefart 9 дней назад

    The wear on teeth shows we were predominantly herbivorous.

  • Kimberly Santasa
    Kimberly Santasa 10 дней назад

    please like thissss its rlly good and it would mean so much to mee.. its for schoolproject www.instagram.com/p/BcUBjMmF469/

  • Anon archist
    Anon archist 11 дней назад

    I still have all my wisdom teeth. all my teeth came in perfectly, and my roots are all twisted around each other.

  • Fploop
    Fploop 11 дней назад

    What would happen if we got so advanced in agriculture that we no longer needed to cook food because everything became liquidized? Would evolution over a large period of time make us loose our teeth completely?

  • Zion
    Zion 12 дней назад

    I was born with straight teeth and every time I go to the dentists they are surprised I never had braces

  • BuckShotFTW
    BuckShotFTW 12 дней назад

    The big theory right now is diet. if you look at the jaw of the tribes in Africa and South America, they wide jaws, and very good looking teeth. Now introduce western or modern food and drinks into that population and within one generation there is tooth decay and narrowing of the jaw. Think about it, we were not designed in such a way that our teeth fall out or get holes in them. Its simpe our mouth microbiome that is to blame.

  • Nicole R
    Nicole R 13 дней назад

    I have the opposite problem: my teeth are straight but all have spaces between them

  • Tyler-James Denton
    Tyler-James Denton 13 дней назад

    I have never had crooked teeth. Ever since I was little my teeth have been perfectly straight. Everyone asks if I’ve had braces. I got my wisdom teeth removed when I was 15

  • Yang Liu
    Yang Liu 13 дней назад

    Teeth shape could be inherited maternally unless mitochondrial mutation occurs. That's just an observation along with some arguments.

  • Ray Ascione
    Ray Ascione 13 дней назад

    Weird because I have perfect teeth

  • loeka lutters
    loeka lutters 13 дней назад

    My teeth are not crooked i have way enough space in there so why is thath

  • Ron Budd
    Ron Budd 14 дней назад +1

    Should you give a baby beef jerky or baby food?

  • MrJjscrap
    MrJjscrap 14 дней назад

    That's why biltong is so perfect for teething babies

  • Alex Clover
    Alex Clover 14 дней назад

    This doesn’t explain why I have a bunch of random teeth just hanging out in the middle of my mouth 😂

  • Pug Life
    Pug Life 19 дней назад

    Thank you for telling me I thought god wanted me to be ugly but it's because it's a human thing thank you

  • Rayven Lebony
    Rayven Lebony 20 дней назад

    could you please do one about why we have high or sharp canine teeth please

  • rory swastika
    rory swastika 22 дня назад

    I have crooked teeth.. theyre over crowded.. I hate it when I cant smile on the pictures and laugh with my friends confidently when I hang out with them

  • Lyuis4115
    Lyuis4115 22 дня назад

    i hate my teeth, i only have one tooth that makes my teeth crooked, my canine tooth =-=. it's like the only one above my rest straight teeth but useless cause i can't chew with it, it's just hanging up there like wtf what's the point of having this one hanging around, sadly i cant pull this one out :/

  • Riyah Daruca
    Riyah Daruca Месяц назад

    Why is my teeth yellow???? They say that yellow teeth are stronger that white teeth. Is it true?
    I'm hoping that my Qs will be answered.

  • Mysterious Flower
    Mysterious Flower Месяц назад

    No crowded or crooked teeth but have an underbite

  • Malena Sandim
    Malena Sandim Месяц назад

    I had to have 8 teeth removed because they were too big for my mouth.

  • Dalir Kosimov
    Dalir Kosimov Месяц назад

    Teeth insecurity makes me sick.
    Interpret this comment however you like.

  • Christian Loder
    Christian Loder Месяц назад

    how come my front tooth sticks out and sometimes when I close my mouth, the tooth tries to stick out of my mouth?

  • ANISH KUMAR SAHOO Sahoo
    ANISH KUMAR SAHOO Sahoo Месяц назад

    can u tell me any situation in which thrust is not there rather any other force may be acting?

  • Jess Giang
    Jess Giang Месяц назад

    What about people who naturally have straight teeth? Was it just luck? Or do their eating habits still have something to do with it? Both?

  • I Need U RapMon's brain cause I need help on math

    My teeth were naturally straight, I just did so many stupud things that they started to get crooked 😂😂😂

  • Emily Jackson
    Emily Jackson 2 месяца назад

    What about the use of bottles and dummies or pacifiers for infants/toddlers and even children and the effect they have on teeth?

  • Ochaco Uraraka
    Ochaco Uraraka 2 месяца назад +1

    Ok I have another question why are some of use missing our teeth I had to get 6 teeth pulled before getting my braces because there was no adult teeth behind them

  • Tanja Tanja
    Tanja Tanja 2 месяца назад +1

    Am I the only one who never had to wear braces? :D

  • jtech0
    jtech0 2 месяца назад

    I have had family suggest having my tooth fixed, but I just don't care that much and i con't see it causing any issues. I have an Asian friend and they said to any of them people with perfect teeth like many in the US seem to like would be nuts. I guess in Asia crooked teeth, etc is cute. In my book if it don't cause health issues then I say who cares.

  • Amelia Salisbury
    Amelia Salisbury 2 месяца назад

    Thats funny because i used to have issues eating meat when i was a kid because i just chewed the same bite for like 20min at a time.
    I also happen to have a longer and narrower jaw... 🤔 (according to my orthodontists)

  • PB PotatoBoi
    PB PotatoBoi 2 месяца назад

    666 views ._.

  • Arthur O'Brien
    Arthur O'Brien 2 месяца назад

    Even more evidence there is significant evolution going on since the invention agriculture. That will make a lot of things even harder to explain. Slighty annoying and quite interesting.

  • Dee Elmore
    Dee Elmore 3 месяца назад

    *chews intensely*

  • CookieTheKitten
    CookieTheKitten 3 месяца назад +1

    I have crooked teeth😖

  • Tira T
    Tira T 3 месяца назад

    Augh! I can't stop watching your videos!!!!

  • The man with no name
    The man with no name 3 месяца назад

    I don't have wisdom teeth

  • Jann Chavez
    Jann Chavez 3 месяца назад +2

    I got a British Ad before I watched this

  • Zom Bee Nature
    Zom Bee Nature 3 месяца назад

    I definitely have crowded teeth
    Please watch my tiny nature videos. There is no talking in them. Shhh!

  • Leah Rose
    Leah Rose 4 месяца назад +1

    Really wish I had braces

  • nyan cat 101
    nyan cat 101 4 месяца назад

    I only had crooked canines... BUT IT WAS AWESOME! They were pointing at my lower lip a little bit and it looked like I had fangs. Too bad they moved into place. Ironically they also were the sharpest out of all my teeth. I miss them so much...

  • Anthony Pucci
    Anthony Pucci 4 месяца назад

    I'm so

  • Mark Gamer
    Mark Gamer 4 месяца назад

    Because chop sticks

  • Helen Rowlett-Barbu
    Helen Rowlett-Barbu 4 месяца назад

    He didn't mention it could also be sexual selection, humans selecting for partners with a smaller, more child like face/mouth. I'm sure everyone had gross teeth back in the day, straight or not so people would likely not care about the look of the teeth over the face.

  • Worshipper_of_Kek
    Worshipper_of_Kek 4 месяца назад

    Why do teeth grow out the side of my gums and roof of the mouth?

  • Infinity- Agario
    Infinity- Agario 4 месяца назад

    What.. My cousin had all her teeth out by the age 9 and her teeth are 100% perfect and I never got all my teeth out yet. I left my baby canine teeth stay there and my adult canine teeth went around the baby tooth.. It seems like my teeth were supposed to be perfect but I left my dumbass baby teeth stay there... DAMMIT

  • JeffyIsMyGod11
    JeffyIsMyGod11 5 месяцев назад +1

    I will accept my crooked teeth instead of throwing thousands of dollars for differently aligned teeth

  • Jumin Han
    Jumin Han 5 месяцев назад

    That actually makes sense that the jaw shrunk. For some people, the wisdom teeth cause pain since it's growing in and there is no room. This happened to me and I have to get them removed when I'm 16.

  • Jules Xxx
    Jules Xxx 5 месяцев назад +2

    it sucks cuz I have crooked teeth but can't afford braces so I'll have to suffer forever

    • I ON MAX
      I ON MAX 2 месяца назад

      Jules Xxx SAME I'm sad

  • Alina S.
    Alina S. 5 месяцев назад

    Apparently my body just decided that there's too much teeth in my mouth, so it completely eliminated the two adult teeth that's supposed to go on either side of your buck teeth. And this only happens to 5% of the people in the world, so I guess I'm just "lucky". Now I have to go through years of my dentist trying to reshape and rearrange the teeth in my mouth so my smile actually looks normal. But till then, I will forever smile with my mouth closed, because my upper teeth are severely messed up; not only because of those missing teeth, but also because I for some reason also have some weirdly sharp teeth that refused to go away for a long time, (and actually most of my remaining baby teeth refuse to fall off). I actually would have preferred them to stay, because one of them fell off around a year ago, and now I look like a freaking pirate with two large buck teeth, no tooth next to my buck tooth, and then a sharp tooth after. One kinder gardener in school actually resulted in calling me, "shark tooth girl" every time she ran in to me. I can't wait until my teeth look normal again..

  • DinoDaffodil 92
    DinoDaffodil 92 5 месяцев назад

    I don't really chew my food that much. No wonder I have no space in my mouth

  • Chelsea Tv
    Chelsea Tv 5 месяцев назад

    Yea... that might be a problem

  • Piemasteratron
    Piemasteratron 5 месяцев назад

    What's the deal with macaroni cheese? I mean it's nice one in a while but that's about it. You people need to have more pies in your lives

  • TealFlame1
    TealFlame1 5 месяцев назад

    And here I am wondering why my jawline is so prominent and why my chin doesn't cut the corner between my neck and the bass of my jaw.

  • Dee B
    Dee B 5 месяцев назад

    Hank for President
    John for Vice President

  • Janik Bollh von horst
    Janik Bollh von horst 5 месяцев назад

    311 British people disliked

  • The Hammie Matt
    The Hammie Matt 5 месяцев назад

    why is one ball lower than the other

  • Adriana Moradel
    Adriana Moradel 5 месяцев назад

    I was born with perfect teeth

  • Danae Kelly
    Danae Kelly 6 месяцев назад

    What causes reed breath? (When you're playing a woodwind instrument that isn't the flute and all of a sudden your breath stinks really bad and the reed stinks really bad.)

  • Jacob Justice
    Jacob Justice 6 месяцев назад

    I hate braces so much I was forced to get them on just because of an overbite

  • BloomSTRAD
    BloomSTRAD 7 месяцев назад

    This isn't always the case for some people. We also have to mention that skull shape is also important in this matter, people with flat skulls tend to have more space for their jaw than people with rounded skulls [by flat and round, I mean the way it looks from behind]. In some cases, the teeth might not even crook at all despite the diet of the person.

  • Peter van Ryn
    Peter van Ryn 7 месяцев назад

    Yea. Mac n cheese. mmmmm

  • Victoria Famoriyo
    Victoria Famoriyo 7 месяцев назад

    I like his shirt

  • Erwin Schrödinger
    Erwin Schrödinger 7 месяцев назад +1

    Since Kid I have my teeth so crooked that I'll replace them with implants.

    • ko aung
      ko aung 5 месяцев назад

      Erwin Schrödinger did you replace them with implants?

  • frank Guan
    frank Guan 7 месяцев назад

    So vegans will more likely to have crooked teeth :)

  • Teeyah Arroyo
    Teeyah Arroyo 7 месяцев назад

    I'll be wearing braces next week since my teeth aren't crooked although in the front area, I have three of my tooth below that are place onwards so my teeth are considered under bite. I am hoping that a normal brace will do a job, maybe I'll be wearing them more than 2 years. I am excited yet nervous. Love your vids! 🙏 FROM PHILIPPINES ❤

  • Ima Dork
    Ima Dork 7 месяцев назад

    Crooked teeth are so cute though. Anyone with me?

    • Shiron
      Shiron 7 месяцев назад

      ew no

  • NoNameC68
    NoNameC68 7 месяцев назад

    I never got braces when growing up, so my teeth are a bit crooked. However, I also never had to get my wisdom teeth removed. I'm wondering if allowing my teeth to become a bit crooked gave my wisdom teeth room to come in.
    Straight teeth are over rated.

  • Ausintune
    Ausintune 7 месяцев назад

    no?? crooked teeth??? fix your diet e.e

  • polyanthesis
    polyanthesis 7 месяцев назад

    i never needed braces and still have my wisdom teeth, no crowding.

  • Littletwinkster AJ
    Littletwinkster AJ 7 месяцев назад

    You should see my dog's teeth..

  • GoogleHelpYou
    GoogleHelpYou 7 месяцев назад

    So the reason we have wisdom teeth is not because of descent with modification, but rather we eat softer food?

  • joe4490
    joe4490 7 месяцев назад

    At the head of the episode you said people "need or want to have their teeth straightened". You answered part one but didn't get at part 2, the "want" part - which is that modern humans in certain cultures place a lot of emphasis on the visual appearance of teeth. The 'crooked teeth' of an American will often be perceived as normal teeth in many other parts of the world. This leads to a much higher emphasis in certain countries or cultural spheres on attaining a certain look or arrangement of teeth, which has little to no impact on comfort or functionality outside of societal perceptions. So perception of tooth crookedness is at least partly cultural, and not genetic OR plastic.

  • Never posting
    Never posting 7 месяцев назад

    Lol there was an add about Dentist doctor Daniel Daniel :=

  • Amanda Hydro
    Amanda Hydro 7 месяцев назад

    I feel like a lot of people don't "need" braces, slightly crooked teeth aren't a medical problem.

  • PyroJohn19
    PyroJohn19 7 месяцев назад

    Hyraxs are not rodents!

  • Ayab41
    Ayab41 7 месяцев назад

    What about tooth gaps? I have them but im getting braces

  • Alice in Overwatch
    Alice in Overwatch 7 месяцев назад

    i was born with 2 adult teeth missing (the 2 next to your front teeth) and 2 wisdom teeth down the bottom and none at the top............. now to be "aesthetically pleasing" i have to pay $10k... how tf is that fair... and that was after $8k my mum paid for bracers when i was growing up... should do a video on why dentist charge so much.

  • Frank Thoughts
    Frank Thoughts 7 месяцев назад

    It would be enough to have a toy to chew. We could keep the delicious food and have big jaws!

  • Born Hater
    Born Hater 7 месяцев назад

    My teeth is pretty straight already. I don't need braces.

  • Ryan Gorsegner
    Ryan Gorsegner 7 месяцев назад

    Does this mean if I chew gum a lot I don't have to get my wisdom teeth removed?

  • Kami Chan
    Kami Chan 7 месяцев назад

    braces are death

  • donkay
    donkay 7 месяцев назад

    Never been to the dentist never need to. My teeth are really good but my front teeth are slightly pointed outwards.

  • TomDelonge's FunnyPicture
    TomDelonge's FunnyPicture 7 месяцев назад

    This video made my teeth go gray

  • Marco Bott
    Marco Bott 7 месяцев назад

    girls with braces are super cute!

  • Sten saxpåse
    Sten saxpåse 7 месяцев назад

    Mewing helps with crooked teeth and wisedom teeth

  • Side Ponytail .Girl
    Side Ponytail .Girl 7 месяцев назад

    Nobody in my family ate too much soft foods growing up (except for toddlers, naturally), I remember always biting in whole carrots and apples as snacks, thus nobody in my family ever needed braces. However, my perfectly straight teeth started getting crooked once all four of my wisdom teeth came in. They just pushed them around a little. So annoying.

  • you-are-the-pelican-man
    you-are-the-pelican-man 7 месяцев назад

    my teeth are not crooked why are you telling me they are.

  • dallen3000
    dallen3000 7 месяцев назад

    could this be a reason why small kids chew on things, because they subconsciously want to make their teeth stronger?

  • Cornhole Jackson
    Cornhole Jackson 7 месяцев назад +5

    so like if i have a kid i just have to feed it lots of tree bark.

    • B
      B Месяц назад

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  • BushDid9/11
    BushDid9/11 7 месяцев назад

    I wanted to brag about my naturally straight strong healthy teeth but i have a feeling my wisdom teeth, grinding, and tmj are going to eventually start biting me in the ass for it 😂

  • A Fucking Human Being
    A Fucking Human Being 7 месяцев назад

    lol brush ur fucking teeth so you won't wear braces they're nasty

  • Max Dumont
    Max Dumont 7 месяцев назад

    can you do my Honors Biology Homework Hank?