Why Do We Have Such Crooked Teeth?

  • Опубликовано:  3 месяца назад
  • 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
  • КатегорииОбразование
  • Длительность: 2:58
  • Тэги для этого Видео:  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: 1 498

  • Janik Bollh von horst
    Janik Bollh von horst 15 часов назад

    311 British people disliked

  • The Hammie Matt
    The Hammie Matt 3 дня назад

    why is one ball lower than the other

  • Adriana Moradel
    Adriana Moradel 4 дня назад

    I was born with perfect teeth

  • Nae Harris
    Nae Harris 9 дней 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 14 дней назад

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

  • π_Rol
    π_Rol 1 месяц 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 1 месяц назад

    Yea. Mac n cheese. mmmmm

  • Victoria Famoriyo
    Victoria Famoriyo 1 месяц назад

    I like his shirt

  • Erwin Schrödinger
    Erwin Schrödinger 1 месяц назад

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

  • frank Guan
    frank Guan 1 месяц назад

    So vegans will more likely to have crooked teeth :)

  • Teeyah Arroyo
    Teeyah Arroyo 1 месяц 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 1 месяц назад

    Crooked teeth are so cute though. Anyone with me?

    • Shiron
      Shiron 1 месяц назад

      ew no


  • NoNameC68
    NoNameC68 1 месяц 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 1 месяц назад

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

  • polyanthesis
    polyanthesis 1 месяц назад

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

  • Littletwinkster AJ
    Littletwinkster AJ 1 месяц назад

    You should see my dog's teeth..

  • GoogleHelpYou
    GoogleHelpYou 1 месяц назад

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

  • joe4490
    joe4490 1 месяц 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.

  • ClearlyAquaticLPS
    ClearlyAquaticLPS 1 месяц назад

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

  • Amanda Hydro
    Amanda Hydro 1 месяц назад

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

  • PyroJohn19
    PyroJohn19 1 месяц назад

    Hyraxs are not rodents!

  • Ayab41
    Ayab41 2 месяца назад

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

  • Alice in Overwatch
    Alice in Overwatch 2 месяца 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.

  • Bill Clod
    Bill Clod 2 месяца 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 2 месяца назад

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

  • Ryan Gorsegner
    Ryan Gorsegner 2 месяца назад

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

  • Kami Chan
    Kami Chan 2 месяца назад

    braces are death

  • Meg Griffin
    Meg Griffin 2 месяца 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 2 месяца назад

    This video made my teeth go gray

  • Siddharth Choudhary
    Siddharth Choudhary 2 месяца назад

    girls with braces are super cute!

  • Sten saxpåse
    Sten saxpåse 2 месяца назад

    Mewing helps with crooked teeth and wisedom teeth

  • Side Ponytail .Girl
    Side Ponytail .Girl 2 месяца 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 2 месяца назад

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

  • dallen3000
    dallen3000 2 месяца 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 2 месяца назад

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

  • BushDid9/11
    BushDid9/11 2 месяца 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 2 месяца назад

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

  • Max Dumont
    Max Dumont 2 месяца назад

    can you do my Honors Biology Homework Hank?

  • SCdreamdrawer
    SCdreamdrawer 2 месяца назад

    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 2 месяца назад

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

  • Gabriela Barrientos
    Gabriela Barrientos 2 месяца назад

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

  • BeatDroppingBeats
    BeatDroppingBeats 2 месяца назад

    why can't life befair tome

  • Tate Hendricks
    Tate Hendricks 2 месяца назад

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

  • Brasley Baksza
    Brasley Baksza 2 месяца назад

    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 2 месяца назад

    im gonna need a gesher soon

  • Whitney f
    Whitney f 2 месяца назад

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

  • Hector Pacheco
    Hector Pacheco 2 месяца назад

    if you're Christian, then none of this applies

  • Phoenix
    Phoenix 2 месяца назад

    Haha,I got perfect teeth fuckers!

  • Samus Kerrigan
    Samus Kerrigan 2 месяца назад

    chewing intensifies

  • GlitchGaming45
    GlitchGaming45 2 месяца назад

    Damn oreos gave me cavities

  • Marnie Pablo
    Marnie Pablo 2 месяца назад

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

  • Bacchanalia
    Bacchanalia 2 месяца назад

    My teeth are biologically perfect.

  • Ano N. Ymous
    Ano N. Ymous 2 месяца назад

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

  • TheCraftingCat
    TheCraftingCat 2 месяца назад

    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 2 месяца назад

      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 2 месяца назад

    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. 2 месяца назад

    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 2 месяца назад

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

  • watts300
    watts300 3 месяца назад

    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 2 месяца назад

      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 3 месяца назад

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

  • Nemo Fil
    Nemo Fil 3 месяца назад

    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 3 месяца назад

    Especially if it got maggot cheese!

  • Peter mG
    Peter mG 3 месяца назад

    Mac n cheese is like soup to me

  • coolsarahkry1
    coolsarahkry1 3 месяца назад

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

  • Chapter Eleven
    Chapter Eleven 3 месяца назад

    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 3 месяца назад

    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 3 месяца назад

    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 3 месяца назад

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

  • Sanjuan Guestsr
    Sanjuan Guestsr 3 месяца назад

    Hank's the best

  • Feynstein 100
    Feynstein 100 3 месяца назад

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

  • IsaacSnider DoesThisOneThing
    IsaacSnider DoesThisOneThing 3 месяца назад

    Wow that shirt

  • eustagoesout
    eustagoesout 3 месяца назад

    blame it on the weather

  • M Jenci
    M Jenci 3 месяца назад

    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 3 месяца назад

    Please do a video on TMJ and Teeth grinding.

  • JBTechCon
    JBTechCon 3 месяца назад

    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 ­ 3 месяца назад

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

  • Anujan Kirupakaran
    Anujan Kirupakaran 3 месяца назад

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

  • TheMonsterAbyss
    TheMonsterAbyss 3 месяца назад

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

  • Rebecca Lopez
    Rebecca Lopez 3 месяца назад

    Pics would have been nice but I still learned a lot

  • crossfire367
    crossfire367 3 месяца назад

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

  • gigantkranion
    gigantkranion 3 месяца назад

    "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 3 месяца назад

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

  • Nin10
    Nin10 3 месяца назад

    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 _ 3 месяца назад

      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 3 месяца назад

    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

  • ccggenius12
    ccggenius12 3 месяца назад

    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?

  • MinecraftCats Cat
    MinecraftCats Cat 3 месяца назад

    I hate braces no one likes them, I have braces them WHAT NO MAC AND CHEESE that's what they SAY TO EAT DUMBO

  • Socks, shoes, and hats
    Socks, shoes, and hats 3 месяца назад

    Wait... aren't hyraxes related to elephants and manatees, not rabbits and rodents?

  • atlastpeace
    atlastpeace 3 месяца назад

    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.

  • Fern Moore
    Fern Moore 3 месяца назад

    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

  • Johey Jonsson
    Johey Jonsson 3 месяца назад

    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.

  • Adam Xyz
    Adam Xyz 3 месяца назад

    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

  • yoyomomishungryz
    yoyomomishungryz 3 месяца назад

    Some dogs have crooked teeth

  • SPACKlick
    SPACKlick 3 месяца назад

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

  • funmbimoti
    funmbimoti 3 месяца назад

    speak for y'all selves....my teeth are perfectly straight.....

  • Frank Tufano
    Frank Tufano 3 месяца назад

    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.

  • Rin Tohsaka
    Rin Tohsaka 3 месяца назад

    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.

  • Angel Diaz
    Angel Diaz 3 месяца назад

    i never had crooked teeth. never needed braces. #blessed

  • Melissa Nehr
    Melissa Nehr 3 месяца назад

    Removed my wisdom teeth under the belief it would prevent my crowding. It didn't =_= adult braces anyone?

  • Bendy the Dancing demon
    Bendy the Dancing demon 3 месяца назад

    ......

  • Casey Monaghan
    Casey Monaghan 3 месяца назад

    but steak is really chewy...

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