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 ---------- Learn more about the March for Science: https://www.marchforscience.com/ Knowledge Is Power Merch: https://store.dftba.com/collections/scishow Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters—we couldn t make SciShow without them! Shout out to Kevin Bealer, Mark Terrio-Cameron, KatieMarie Magnone, Patrick Merrithew, Charles Southerland, Fatima Iqbal, Benny, Kyle Anderson, Tim Curwick, Scott Satovsky Jr, Philippe von Bergen, Bella Nash, Bryce Daifuku, Chris Peters, Patrick D. Ashmore, Charles George, Bader AlGhamdi ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- 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