Why Do We Have Such Crooked Teeth?

  • Added:  5 months ago
  • 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
  • EducationEducation
  • Runtime: 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  

Comments: 1 514

  • Leah Rose
    Leah Rose 5 days ago

    Really wish I had braces

  • nyan cat 101
    nyan cat 101 6 days ago

    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 13 days ago

    I'm so

  • Mark Gamer
    Mark Gamer 14 days ago

    Because chop sticks

  • Helen Rowlett-Barbu
    Helen Rowlett-Barbu 18 days ago

    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.

  • Kekistanilemon.
    Kekistanilemon. 20 days ago

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

  • Infinity- Agario
    Infinity- Agario 21 day ago

    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

  • ApexGamer
    ApexGamer Month ago

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

  • Jumin Han
    Jumin Han Month ago

    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 Month ago +1

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

  • Al527
    Al527 Month ago

    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 Month ago

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

  • Chelsea Toys
    Chelsea Toys Month ago

    Yea... that might be a problem

  • Piemasteratron
    Piemasteratron Month ago

    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 Month ago

    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.

  • Ferdie Barrientos
    Ferdie Barrientos Month ago

    Hank for President
    John for Vice President

  • Janik Bollh von horst

    311 British people disliked

  • The Hammie Matt
    The Hammie Matt Month ago

    why is one ball lower than the other

  • Adriana Moradel
    Adriana Moradel 2 months ago

    I was born with perfect teeth

  • Nae Harris
    Nae Harris 2 months ago

    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 2 months ago

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

  • BloomSTRAD
    BloomSTRAD 3 months ago

    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 3 months ago

    Yea. Mac n cheese. mmmmm

  • Victoria Famoriyo
    Victoria Famoriyo 3 months ago

    I like his shirt

  • Erwin Schrödinger
    Erwin Schrödinger 3 months ago +1

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

    • ko aung
      ko aung Month ago

      Erwin Schrödinger did you replace them with implants?


  • frank Guan
    frank Guan 3 months ago

    So vegans will more likely to have crooked teeth :)

  • Teeyah Arroyo
    Teeyah Arroyo 3 months ago

    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 3 months ago

    Crooked teeth are so cute though. Anyone with me?

  • NoNameC68
    NoNameC68 3 months ago

    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 3 months ago

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

  • polyanthesis
    polyanthesis 3 months ago

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

  • Littletwinkster AJ
    Littletwinkster AJ 3 months ago

    You should see my dog's teeth..

  • GoogleHelpYou
    GoogleHelpYou 3 months ago

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

  • joe4490
    joe4490 3 months ago

    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 3 months ago

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

  • Amanda Hydro
    Amanda Hydro 3 months ago

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

  • PyroJohn19
    PyroJohn19 3 months ago

    Hyraxs are not rodents!

  • Ayab41
    Ayab41 3 months ago

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

  • Alice in Overwatch
    Alice in Overwatch 3 months ago

    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.

  • Bill Clod
    Bill Clod 3 months ago

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

  • Born Hater
    Born Hater 3 months ago

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

  • Ryan Gorsegner
    Ryan Gorsegner 3 months ago

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

  • Kami Chan
    Kami Chan 3 months ago

    braces are death

  • Meg Griffin
    Meg Griffin 3 months ago

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

  • TomDelonge's FunnyPicture

    This video made my teeth go gray

  • Marco Bott
    Marco Bott 3 months ago

    girls with braces are super cute!

  • Sten saxpåse
    Sten saxpåse 3 months ago

    Mewing helps with crooked teeth and wisedom teeth

  • Side Ponytail .Girl
    Side Ponytail .Girl 3 months ago

    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

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

  • dallen3000
    dallen3000 4 months ago

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

  • Cornhole Jackson
    Cornhole Jackson 4 months ago +3

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

  • BushDid9/11
    BushDid9/11 4 months ago

    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 4 months ago

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

  • Max Dumont
    Max Dumont 4 months ago

    can you do my Honors Biology Homework Hank?

  • SCdreamdrawer
    SCdreamdrawer 4 months ago +1

    Now I wonder how your jaw and teeth would be affected if you were raised on an all liquid diet like Soylent or Queal.

  • KingCamembert
    KingCamembert 4 months ago

    Could chewing gum and such increase jaw size during growing up? I mean it uses 'intense chewing power' after time.

  • Gabriela Barrientos
    Gabriela Barrientos 4 months ago

    "Our jaws SHRANK"????? isn't it supposed to be "our jaws SHRUNK"?

  • BeatDroppingBeats
    BeatDroppingBeats 4 months ago

    why can't life befair tome

  • Tate Hendricks
    Tate Hendricks 4 months ago

    Is anybody watching this, while we don't have crooked teeth?

  • Brasley Baksza
    Brasley Baksza 4 months ago

    Disagree. That only accounts for crowding teeth, not funky ass yuck-mouth. Jaw length and breadth varies across humans and there are populations that have higher frequency of nice teeth despite little variation in jaw:tooth size ratio.
    Two conclusions: Straight teeth aren't being selected for and do more thorough research.

  • the memer of dank
    the memer of dank 4 months ago +1

    im gonna need a gesher soon

  • Whitney f
    Whitney f 4 months ago

    I have never had braces and my teeth are almost perfect.

  • Hector Pacheco
    Hector Pacheco 4 months ago

    if you're Christian, then none of this applies

  • Corvus
    Corvus 4 months ago

    Haha,I got perfect teeth fuckers!

  • Samus Kerrigan
    Samus Kerrigan 4 months ago

    chewing intensifies

  • GlitchGaming45
    GlitchGaming45 4 months ago

    Damn oreos gave me cavities

  • Marnie Pablo
    Marnie Pablo 4 months ago

    Scishow why do we have stretch marks and how can we get rid of it pls a video about it.

  • Bacchanalia
    Bacchanalia 4 months ago

    My teeth are biologically perfect.

  • Ano N. Ymous
    Ano N. Ymous 4 months ago

    2:36 'Thank you for asking and thank you especially to Oliver Patreons' jk

  • TheCraftingCat
    TheCraftingCat 4 months ago

    But are they bad? My teeth are very crooked, so my mom and the dentist are saying that I need braces. But I don't want them, I like my teeth how they are. So is it a serious problem?

    • Jennifer Dally
      Jennifer Dally 4 months ago

      If they are so crooked that you can't properly clean all of them, then braces should be seriously considered, but if you can clean them correctly then it isn't as much of a necessity. You should also take into account of how old you are, if you're still in elementary or middle school, then your jaw may not have fully grown so your teeth may straiten out at least a little bit.


  • bandit957
    bandit957 4 months ago

    Why do we all have crooked teeth? Because we're just so cool, and only cool people are allowed to have crooked teeth.

  • Vanessa G.
    Vanessa G. 4 months ago

    I've always had perfectly straight teeth since my permanent ones grew in without the use of braces or any of those other straightening methods, guess I'm just lucky 🤷🏻‍♀️ can't help but to flaunt my smile lol

  • Jaeger The Great
    Jaeger The Great 4 months ago

    My family actually has a history of being born without certain teeth, like my sister only had 3 wisdom teeth.

  • watts300
    watts300 4 months 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?

    • Jennifer Dally
      Jennifer Dally 4 months ago

      From my experience, many people from those cultures do like it when they have it, but they don't have it super frequently (mac and cheese is a ridiculously American/North American thing).


  • science ki vines
    science ki vines 4 months ago

    why are my teeth above jaw line? can it be fixed(above another teeth)

  • Nemo Fil
    Nemo Fil 5 months 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!

  • Geflügel HNZ
    Geflügel HNZ 5 months ago

    Especially if it got maggot cheese!

  • Peter mG
    Peter mG 5 months ago

    Mac n cheese is like soup to me

  • coolsarahkry1
    coolsarahkry1 5 months ago

    I love your shirt. It's...hypnotizing...

  • Chapter Eleven
    Chapter Eleven 5 months 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.

  • iicharliieii 2142
    iicharliieii 2142 5 months 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...

  • David Salley
    David Salley 5 months 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.

  • Courtney Courteau
    Courtney Courteau 5 months ago

    I could've gotten braces but I chose not to.

  • Sanjuan Guestsr
    Sanjuan Guestsr 5 months ago

    Hank's the best

  • Feynstein 100
    Feynstein 100 5 months ago +1

    My canines are slightly bigger than the rest of my teeth. Was I meant to be a vampire?

  • IsaacSnider DoesThisOneThing

    Wow that shirt

  • eustagoesout
    eustagoesout 5 months ago

    blame it on the weather

  • M Jenci
    M Jenci 5 months 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.

  • MrAstronomer 22
    MrAstronomer 22 5 months ago

    Please do a video on TMJ and Teeth grinding.

  • JBTechCon
    JBTechCon 5 months 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.

  • TomatoHeadGaming ­
    TomatoHeadGaming ­ 5 months ago

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

  • Anujan Kirupakaran
    Anujan Kirupakaran 5 months ago

    I'm hoping I don't get braces coz my younger sister has them and they look painful

  • TheMonsterAbyss
    TheMonsterAbyss 5 months ago

    Lol, i was searching for Papa Roach's song and I find this...

  • Rebecca Lopez
    Rebecca Lopez 5 months ago

    Pics would have been nice but I still learned a lot

  • crossfire367
    crossfire367 5 months ago

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

  • gigantkranion
    gigantkranion 5 months 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.

  • Damian the Phoenix
    Damian the Phoenix 5 months ago

    Damnit, Hank....now I have a craving for mac and cheese

  • Nin10
    Nin10 5 months 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?

    • Shaz _
      Shaz _ 5 months ago

      Because you will die from either toxins or bacterias. You can't find a clean water source in most areas anymore. Modern human body simply doesn't have the tools to deal with those anymore. Apparently bottled spring water suffices? You can drink that, and you can drink from clean sources.


  • Hortonius Imperialus
    Hortonius Imperialus 5 months 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

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