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Why Do We Have Baby Teeth?

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What’s up with baby teeth? Do other animals have them, and what are they good for -- other than squeezing money out of the tooth fairy? We have the answers! Hosted by: Hank Green ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow Or help support us by subscribing to our page on Subbable: https://subbable.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Thanks Tank Tumblr: http://thankstank.tumblr.com Sources: http://www.nhm.ac.uk/nature-online/evolution/what-is-the-evidence/morphology/milk-teeth/ http://www.uic.edu/classes/orla/orla312/DeciduousDent.htm http://www.vivo.colostate.edu/hbooks/pathphys/digestion/pregastric/dentalanat.html
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Text Comments (1218)
flora yang (17 days ago)
Why do I have only 3 wisdom teeth when it should grown in set?
TerminalVerbosity (1 month ago)
Why can't we replace teeth like other species do? What on earth is the advantage? Or is it just another "sacrifice to feed the brain", like all the other cool features we don't get to have.
Bryn Truelove (2 months ago)
If our mouths didn't get smaller, wisdom teeth would be helpful because of all the meat with bones would break our teeth and we would have no teeth, so we would grow new ones. But all the processed foods don't break our teeth as much, so wisdom teeth are a waste of space.
Harmbow Salem (2 months ago)
I never got my wisdom teeth. I am 36 now. X-rays that I get for my teeth show that I just don't have wisdom teeth at all.
Avery Finney (3 months ago)
I have this weird genetic malfunction where I don’t have permanent teeth under my bottom 2 first molars so I’ll never loose them (hopefully)
zyxwvutsrqponmlkh (3 months ago)
Why cant all your videos have the same audio level.
Duke00x (4 months ago)
I knew some people growing up that had multiple sets of adult teeth. It ran in the family.
Friend House (5 months ago)
I have a baby canine teeth at the age 20 ! What should I do
GIRGHGH Aka Girg (6 months ago)
Are there animals who get their adult teen first and just fill space instead of replacing teeth?
Lardo Yek (6 months ago)
Potstickers portioned evenly over a small plate. How many potstickers are there?
NICE_PAPRIKA (6 months ago)
I was terrified of wobbly teeth because I was afraid that I would swallow them while sleeping... and then I wouldn't tell my parents about it because both my parents are dentists and they always joked about pulling my teeth out... how fun
Miss Lissa Day (7 months ago)
I had 3 sets of teeth and so did my father. I guess it's genetic.
Sean Not-telling (7 months ago)
Why other than to balance the bite do we need to replace teeth? I think i know the answer but would like to know for sure. What I was told it has to do with the jaw bone density. Is this true or noe and can you talk about it in a show? Thanks
MysteryKitty 13 (7 months ago)
My front two teeth never fell out when I was five or I don’t get it and I’m 10
Vysair (7 months ago)
I still....have them...
Zach Gamez (8 months ago)
0:43 that picture is terrifying
Steve Dryden (8 months ago)
luckily i never had wisdom teeth
Darkfireice (8 months ago)
As an adult, why do I still have several baby teeth?
Greed (8 months ago)
My wisdom teeth are coming in and the other day I hit down on a chip but it stabbed the skin that the tooth hadn’t yet broken and it hurt like hell
richard Hernandez (8 months ago)
Why do we have Moes
Aaron Lowe (8 months ago)
I only have 3 wisdom teeth. None of them broke through the gum line and instead grew at a 90 degree angle from norm into my skull. The 4th missing tooth shows no sign of ever existing.
Scythal (10 days ago)
Aaron Lowe youch thankfully mine are erupting properly
horse14t (8 months ago)
Wait... I remember my baby molars being the last baby teeth I lost.. My incisors being the first :/
ProfessorHacks (9 months ago)
One thing wrong with this video. Our jaws didnt get smaller because of evolution. The soft starchy diets that came with the agricultural revolution, didnt require a lot of chewing. Hence less developed mouth musculature and bone. Plenty of people have their wisdom teeth, including me, and in third world countries every one has them, because of tough diets. I mean that they fit perfectly in their mouthes.
Anie Anton (9 months ago)
my 6 siblings and I (so i am assuming genetic) have gotten 2 sets of baby "eye" teeth, then the adult tooth. So one set pops out, falls out, then another pops out, then falls out, then the adult teeth. I am the only one of us that did not get my "3rd" set. my adult tooth. I still have a baby tooth in place. it has come loose often, but became solid and by age 28 it started to break down. No adult tooth to replace it. I was told it would not stay in my mouth past age 16. I still have it, age 25, but it is tiny, shaven down, useless. Eventually I will get it removed when I can afford a fake tooth. Luckily we only have those baby teeth. Imagine if all our teeth had to go through falling out and teething for the first 20 or so years of our lives? yikes!
TheCynicalDouche (9 months ago)
Whoa, you guys all go through a period of having baby teeth? That's weird, different, and wrong.
Question: my family on my mother's side has a history of growing 3 sets of teeth. Why?
Narayan (9 months ago)
*My dad said, if you are in your 100 years age, you can grow the new teeth’s again!*
Joku Toinen (9 months ago)
Yea, one of my biggest fears is living longer than my teeth.
Dani Bright (9 months ago)
I found out somewhat recently that I never had wisdom teeth. (Had some jaw pain from grinding but that was it.) Glad I didn't have to deal with those suckers.
RAMEN-FUNERAL :- (9 months ago)
My back teeth fell out like 3 times and they grew back...I must be weird
Alisha Khan (9 months ago)
Why we have 2 nose holes
Mohammed Rowdi (9 months ago)
I got my wisdom teeth when i was 14... ( befor i reached puberty...)
Bleached_Anus (10 months ago)
Thumbnail is nightmare fuel
Why can't we just keep growing teeth forever
Seth Begley (10 months ago)
Wouldn't it be great if we could grow as many god damn sets of teeth as we wanted like a shark? Dental bills would be so much lower and dentures would never exist.
Scythal (10 days ago)
god: nope, enjoy your high dental bills!
Mystical Orbit (11 months ago)
Anyone else ever have dreams/nightmares about losing adult teeth despite having good dental hygiene?
Mystical Orbit (11 months ago)
Your other bones grow... Why don't teeth just grow like normal bones? ... You don't just shove your tibia out of the flesh of your leg and grow an "adult" one now do you? Yea, didn't think so.
Jason Kurant (11 months ago)
Dude, you said that 100,000,000 years ago "we" needed those wisdom teeth. Well, we humans did not exist then! I think you meant ten million years ago, not one hundred million.
Alyanna Jeserence Jesoro (11 months ago)
As a dentistry student I see a lot of mouths but 0:06 still shocked me Σ(O_O;)
TheOfficialDeathmark (11 months ago)
a man walks into a bar he goes ouch he was on his phone
Skeptical Eye (11 months ago)
The little kid in the last minute has progenia, his lower teeth are in front of the upper ones
Salvatore Escoti (1 year ago)
not only Humans, Almost all Mammals have Baby teeth.
JosephTheGoat (1 year ago)
I have a 2nd pair of canine teeth from my adult teeth growing over baby teeth.. I have to get the baby ones pulled because they aren't moving
The Mushroom Inside (1 year ago)
my sister has three teeth in between her two bottom incisors
blackkittyfreak (1 year ago)
1:37 I'm pretty sure humans weren't around 100 million hears ago...
Mason McKeague (1 year ago)
Why do some people not lose all of their baby teeth?
Amit Yoffe (1 year ago)
Why is the hip and but exactly in the middle?
TheWeirdPotato (1 year ago)
i have none of my baby teeth left. they are all adult teeth.
Luchingador (1 year ago)
well this is the how... not the why....
Nyx M (1 year ago)
That thumbnail was terrifying o-o
MsEeveeMaster (1 year ago)
Why in some cases do the baby teeth not fall out? My dog still has a few of her baby teeth even though she is old and some of her adult teeth have fallen out.
sleet (1 year ago)
I'm 12 and only about half of my baby teeth are out. Is this normal? Send help
B. Eden (1 year ago)
Will there be a scienctific utopia in our lifetime? Like a smart city or a city devoted to scientific discovery seperate from profiting finacially from science (like tampering with results or just caring about the bottom line finacially).
Josie Delaney (1 year ago)
When I was 11, ,I had all of my adult teeth!
Alby George (1 year ago)
U forgot about sharks 🦈
Courtney Woodbury (1 year ago)
I had to have my bottom front baby teeth pulled because my adult ones came in but the baby ones hadn't fallen out. Fortunately, after that the adult ones drifted back and settled nicely into line with the rest.
Mars2030 (1 year ago)
im 15 and i still havnt lost all my baby teeth yet plz send help
Mars2030 (1 year ago)
Yea i have actually gotten the xray when i was younger, and i DO have all the adult teeth. I guess im just a late bloomer.
Why-not (1 year ago)
Maybe you don't have adult teeth beneath your baby teeth. If you get a X-Ray at the dentist or the orthodontist, they will tell you. :) (I'm 20, and I still have 1 or 2 baby teeth that I hope won't fall because I don't have adult teeth to remplace them.)
john william (1 year ago)
man, i wish my teethshee every 1 or 2 years. it would be useful.
Anish Mulchandani (1 year ago)
Then why are they called MILK TEETH?
flibbertygibbet (1 year ago)
Deciduous teeth should still be in until will after a child stops being a toddler. 5 or 6 are the years when the first baby teeth fall out. That's not a toddler. How do I know this B.S.N. retired RN. former child care worker and mom.
ICG AME (1 year ago)
Buttered Bread (1 year ago)
i lost my front teeth first
Shadow Mikazukun (1 year ago)
i lost a tooth while watching this XD
KJV1611 Only (1 year ago)
Thumbs down to evolution, which is not proven therefore has nothing to do with science
You're a Towel (1 year ago)
lol religion
Jessica Angela (1 year ago)
Lmao I see my wisdom teeth in my xrays at the ortho and I'm terrified to get them out 😂 I have an extremely small jaw in the first place too
Ratus (1 year ago)
I messed my teeth up when I was 16... just waiting until 32 to replace them all...get some fake ones..
TheTriforceofRubiks (1 year ago)
Still miss that feeling of a loose baby tooth. So awesome.
Blake Ashley (1 year ago)
Hahaha! Forgot about that, but yes! I remember now! Like sort of itchy and when you wiggle it around its satisfying like scratching an itch.
Adrastia (1 year ago)
I'm missing permanent teeth. Four of my teeth (the pairs next to the incisors) are baby teeth. There are no adult teeth to come in because they never developed. I am very very careful as I cannot afford dentistry. In the US it's a luxury for a lot of people. They should have fallen out a long time ago. I'm just lucky that all of my adult teeth are pretty small. So it's not too jarring to look at. But I do kind of resemble a rabbit if I open wide. There is some kind of spur under the skin inside my lower jaw. The last time I saw a dentist he said it may be an oddly placed undeveloped tooth. It doesn't bother me. The only difficulty I had was with a retainer. I guess the mold wasn't pressed down enough to go over it. So it was a little annoying at first. I think I lost the last of my baby teeth that had permanents coming in when I was 11.
Flip Me Eyes (1 year ago)
ive only lost 2 theth and im 10
Ashish Gupta (1 year ago)
l never lost my baby teeth
Ashish Gupta (1 year ago)
+András Kovács thanks for the info
András Kovács (1 year ago)
+Ashish Gupta Did you make an x-ray over them ? If your teeth are straight and healthy you shouldn't care much about it,expecially because baby teeth have thicker enamel,and are even more bright than adult teeth.
Ashish Gupta (1 year ago)
+András Kovács but i found out that if I ever lose my teeth i wouldn't get them back
András Kovács (1 year ago)
How old are you ?Be happy with it,since you will always have a bonus if you lose one.
getting my wisdom teeth out is my biggest fear, I hope they never come in
horse14t (8 months ago)
Both me and my dad still have all of our wisdom teeth (I have 3, I don't have a 4th lower left wisdom tooth). My dentist told me that if they're not causing problems or pain and grow in relatively straight then you're fine. So really you should hope that the ones you may or may not get grow in straight. (Though getting sores in the back of your mouth sucks when they first come in!)
David T. (2 years ago)
It's kinda weird, I have 28 teeth and I'm 13, yet I never remember losing my molars. I am kinda small for my age, so maybe my mouth it small enough so that I don't have to lose teeth because my mouth isn't growing (yet)
Cynical Cthulhu (2 years ago)
It's just as well. Most people don't take very good care of their baby teeth and by the time your adult teeth start coming in you might need them. Young kids are... not good at brushing.
Mystical Orbit (11 months ago)
Cynical Cthulhu Parents should still make sure kids take care of their baby teeth. Not necessarily for the teeth, but for the health of their gums.
Bhusta Cap (2 years ago)
i never got 4 of my front bottom teeth. like they just didnt exist. i am now 24 and still have baby teeth lol
AnnaIsNotABanana (2 years ago)
People in the comments are still losing teeth at 16?? Damn I'm 15 and I've been done losing teeth since I was like 12
Blake Ashley (1 year ago)
You're going to be losing some more if you don't mind your own business!!! (jk)
snitch (2 years ago)
they're getting teeth, not losing them. and you know 12 wasn't that long ago for you?
Coal Dust XIII (2 years ago)
Here's my question: Why do some baby teeth persist into adulthood?
evilmick66 (2 years ago)
Googled the lead singer of the Pogues after this video. Turns out the guy has teeth now. Took him six months to get a full set of implants. Don't do meth, kids.
Ben Thomason (2 years ago)
I once read in a Riley's article about a very rare condition where someone gets a third set.  One guy even got a fourth set.
RokaSoka (2 years ago)
Well I got my wisdom tooth taken out and it is growing back, note that it was my adult wisdom tooth that was taken out and it is growing back, am I the only one who has grown 3 of them?
Ranger52 (2 years ago)
or not so lucky, as the case may be.
TheRandomHat JF (2 years ago)
Its rare, but some people do grow extra teeth if others fall out or get removed. Lucky you
Simon Douville (2 years ago)
My second pair of teeth never grown (except for the up incisers and a up molary)
Dubwavy (2 years ago)
Wisdoms come later ? I got all 4 around 16 😭
Scythal (10 days ago)
i'm already getting them at 15 aaaaghhh it hurts when they erupt out of the gum
horse14t (8 months ago)
+Turkey Herder I got an embedded one too. I can feel my lower right wisdom tooth under the gum but it hasn't erupted at all. And I don't have a lower left wisdom tooth at all... The two top ones erupted fine and straight though.
Turkey Herder (2 years ago)
+Shush Ackles I have only 1 wisdom tooth and it shows up in xrays, but has not emerged and I am 30.
Dubwavy (2 years ago)
+sillypplproductions2 ooooo gotcha :)
Sillypplproductions2 (2 years ago)
Well, yes, I was saying that yours didn't come in early like you seemed to think they did, but that you got them pretty much right on time.
DemonOfRazgriz1 (2 years ago)
I have only 2 wisdom teeth. both on the top. So far I am not having issues with them which is a relief >w>
András Kovács (1 year ago)
same,but for me only at the bottom.
Dustin Dezeeuw (2 years ago)
Donald Trump needs to make everyone have personal dentist for free less cavities less money spent overall
Dustin Dezeeuw (2 years ago)
It's to give u a second chance at brushing them
Elke Möhle (2 years ago)
What happens if you are sleeping and one of your baby teeth falls out and you accidentally swallow it?
TheSuckySix (2 years ago)
The tooth fairy checks the toilet the day after.
SonOfNenji (2 years ago)
Middle Schoolguide (2 years ago)
well im 12 i still have mine
Nia Lowe (2 years ago)
I really thought the title of the video was 'Why do Babies have teeth?' and was confused why someone questioned that.
yall stupid
Danny Freddy (10 months ago)
Yey dat meens im stupid
J4Seriously (1 year ago)
Guys guys, you can all be stupid.
dakesim (1 year ago)
wow you're even more stupid
Abigail Sockeye (1 year ago)
wow you're really stupid
Ciccarello (2 years ago)
I've always hypothesized that wisdom teeth wouldn't have been a problem even after our jaws shrunk due evolution because I'd imagine by the time most humans were 20, they would have lost a few teeth. In that would it would almost be like, congratulations on making it to 20, you get a bonus set of teeth since your other's are likely in terrible condition.
Windhelm Guard (7 months ago)
wisom teeth don't make a good replacement for other teeth. you must have noticed by now that you have way more strength biting down with your molars, than with your other teeth, this is because they are further back and that is how leavers work. the problem with this is that wisdom teeth grow out so far back, that your jaw muscles can generate enough force to crack them, eve nmy accident. i fortunately do have enough space in my jaws to fit my wisdom teeth in and i have managed to break big chunks out of three of them. also no people didn't die arround 25 very often, that is a myth based on people not understanding how statistics work. the average life expectancy back then was so low because of extremely high infant mortality rates, anyone who lived to 25 could comfortably live another 25 years, without having to fear death arround every corner.
Paul Bedford (1 year ago)
Ciccarello that is actually a very interesting hypothesis, especially since we are given so many molars and their purpose is to grind things up, which isn't the most gentle action on your teeth, and before modern dentistry that was probably the only good teeth left.
yeah, just in time for the humans from so long ago to die around 25 years old lol
Sillypplproductions2 (2 years ago)
You're forgetting about the six year and twelve year molars. By your logic, those molars would have fulfilled the wisdom teeth's role already.
Danielle Stager (2 years ago)
I'm missing a tooth on my bottom jaw. The adult tooth never grew in.
András Kovács (1 year ago)
+Danielle Stager Ty for info.I expected for more.
Danielle Stager (1 year ago)
András Kovács not sure, it was a few years ago. Probably a thousand dollars?
András Kovács (1 year ago)
Well I am glad your problem got fixed.Can I ask you how much did that cost in the USA ?
Danielle Stager (1 year ago)
I had braces and no longer have the gap, and I do live in America! It was pretty expensive, but no one notices that I'm missing a tooth unless I point it out, and it doesn't affect my life that much, if at all.
András Kovács (1 year ago)
Well that sucks,I hope you don't live in Murica'.Here in Romania dental care is cheap.a girl in my class had the same problem as you.4 of her front adult teeth didn't have roots,so they weren't stable and had to be pulled out.Since it was symmetrical she got braces,so the molars got moved a bit further.Go to a dentist and ask for braces too,they will move your teeth further a bit,so there will be no gap.Here teeth are straight and realy beautyful,I didn't even notice(and still can't make a difference) until we talked about it.
Emma Roe (2 years ago)
What physically causes cystic acne (and what can i do to make them stop happening)?
all I could do was use what the dermatologist gave me, stay on routine, and wait it out. I had severe cystic acne that kept gettin worse until about four months ago I noticed that I was only getting 4-5 cystic bumps at a time, now I'm down to 2-4. if I had stuck with my routine instead of quitting a year or so ago I'm sure it would've cleared up faster
ImUhRandii (2 years ago)
what's wrong with the FPS?
Alyssa Chalue2 (2 years ago)
My nephew had all his baby teeth by the he was 1 1/2 years old
k w (2 years ago)
cupcakedemon1029 (2 years ago)
When my two front teeth grew in they were spaced apart and that screwed up some other teeth (not all of them though) so I needed a spacer. I also had an overbite.
not bob ross (2 years ago)
i dont have baby teeth like most people, they are made out of the stuff used to make toilets :T
Döla Freundlich (2 years ago)
Why do our skeletal bones grow as we age, but our teeth don't grow?
András Kovács (1 year ago)
The dentin under the enamel is basically bone tissue,but a harder one.
+ToneyCrimson I'm kinda mad because I've always been told they are bones just like all the other ones wtf good to know though, thanks
ToneyCrimson (2 years ago)
+Barnie Ringus Because teeth and bones are not the same. They aren't even considered bones, they are 2 different things.
Pam Zanco (2 years ago)
There's no such thing as an upper jaw. There is the jaw, or mandible, and there is the maxilla, or the upper arch of teeth. You can refer to them as the upper arch or lower arch if it's easier.
technically a person can refer to it as whatever they want, it just won't be accurate haha, he had to make it more clear for us average folks
MXB Kam (2 years ago)
I have trypophobia and I saw the thumbnail image. Screamed
Odd Soul (26 days ago)
What is that?
TLK Dragon (2 years ago)
That's not trypophobia?
MXB Kam (2 years ago)
You have it?
David Ndiulor (2 years ago)
Please do not say the word
Macayla Cayton (2 years ago)
I got a question that is bugging me why do some people called late bloomers lose or gain stuff later than others? Is it genetic? Is it something to do with the environment we live in? Please answer that for me, that always just figuratively eats at my brain, I have high functioning autism, so when I use figurative language I prefer to say it so I always say it
Farus Alkasem (2 years ago)
It depends on your gender. If you're a male, being a "late bloomer" is because of a chemical called "Testosterone". If you're female, it's because of a chemical called "Estrogen". For males: Testosterone is the chemical that makes a man look and feel like a man. If a boy has less Testosterone, he will go through puberty slower. For females: Estrogen is the chemical that makes a woman look and feel like a woman. If a girl has less Estrogen, she will go through puberty slower.
Tanumay Bandopadhyaya (2 years ago)
Why do I have two lower incisor teeth since birth ? They were already present and rest grew afterwords.

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