{"id":17560,"date":"2020-11-11T21:51:05","date_gmt":"2020-11-12T01:51:05","guid":{"rendered":"https:\/\/www.shortform.com\/blog\/?p=17560"},"modified":"2020-11-14T01:11:16","modified_gmt":"2020-11-14T05:11:16","slug":"why-do-humans-have-teeth","status":"publish","type":"post","link":"https:\/\/www.shortform.com\/blog\/why-do-humans-have-teeth\/","title":{"rendered":"Why Do Humans Have Teeth? Evolution Can Tell Us"},"content":{"rendered":"\n<p>Why do humans have teeth? How did our teeth develop, and why do we need them? <\/p>\n\n\n\n<p>The answer to the question &#8220;why do humans have teeth&#8221; might surprise you. Our teeth evolved over time, partly from our ocean ancestors. Scientists can trace back why humans have teeth to our early ancestors. <\/p>\n\n\n\n<p>So why do humans have teeth? Keep reading to find out. <\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why Do Humans Have Teeth?<\/strong><\/h2>\n\n\n\n<p>Like bones, our teeth also connect us to other living things, past and present, and are thus important to understanding our bodies. This chapter examines how our teeth trace back to early creatures in two ways:<\/p>\n\n\n\n<p>1) Our mix of different types of teeth that fit together (occlude), giving us the ability to efficiently eat a wide variety of things, comes to us courtesy of a tiny 200-million-year-old mouse-like creature.<\/p>\n\n\n\n<p>2) Further, the unique material contained in our teeth, bones, and other tissues\u2014hydroxyapatite\u2014can be traced to fish.<\/p>\n\n\n\n<p>Humans and other animals also benefit in other ways from the biological process that originally developed teeth. It was modified over time for making different kinds of skin structures\u2014scales, feathers, skin, and mammary glands. So why do humans have teeth? What does it mean that they do? <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Lessons From Teeth<\/strong><\/h3>\n\n\n\n<p>Why do humans have teeth? Teeth aren\u2019t very exciting and don\u2019t get much attention in anatomy classes, but they tell scientists a lot about animal lifestyles and diets dating back to the earliest fossils. Because they\u2019re so hard, teeth are often the best-preserved animal part revealed in fossils.<\/p>\n\n\n\n<p>Reflecting our omnivorous diet, humans have a mix of incisors for cutting meat and molars and premolars for chewing meat and plant material. In addition, our upper and lower teeth fit together to chew efficiently.&nbsp;<\/p>\n\n\n\n<p>In contrast, reptiles\u2019 teeth are all the same\u2014for instance, all of a crocodile\u2019s teeth are shaped similarly, although some are larger; they\u2019re replaced regularly as they wear down. They also don\u2019t fit together as mammals\u2019 teeth do. <strong>Mammals are distinctive in having several different kinds of teeth, which are replaced only once<\/strong>.<\/p>\n\n\n\n<p>Mammals\u2019 system of precise chewing first shows up in fossils of a mouse-sized rodent between 195 million and 225 million years old. Shubin and colleagues found fossils of the early mammal, a <em>tritheledont<\/em>, in cliffs along the coast of Nova Scotia. It previously had been found only in Africa. The tiny animal had incisors, canines, and molars and its teeth occluded, indicating it could chew like a mammal, although the incisors rubbed together like scissors rather than fitting precisely as in later mammals. The <em>tritheledont<\/em> also had other mammalian features in its lower jaw and skull.&nbsp;<\/p>\n\n\n\n<p>After finding the <em>tritheledont<\/em> (an intermediate mammal), researchers found various new mammal species with new kinds of occluding teeth suited to new diets. But the <em>tritheledont<\/em> paved the way for diverse eaters, including us. This helps answer the question &#8220;why do humans have teeth?&#8221; <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The Origins of Teeth<\/strong><\/h3>\n\n\n\n<p><strong>The most unique feature of teeth is that they\u2019re harder than other body parts because they have a crystal molecule called hydroxyapatite<\/strong>, particularly in the enamel. The same molecule appears in lesser concentrations in other parts of the teeth, bones, and other tissues.<\/p>\n\n\n\n<p>Our hydroxyapatite-containing tissues contribute to our ability to eat, breathe, move, and metabolize minerals. The substance\u2014which we share with fish, reptiles, birds, amphibians, and mammals\u2014traces back to a <a href=\"https:\/\/www.shortform.com\/blog\/charles-darwins-tree-of-life\/\">common ancestor<\/a>.<\/p>\n\n\n\n<p>The first teeth, 250 million to 500 million years old, were found in the 1830s and belonged to jawless fish or lamprey-like creatures. However, scientists found the teeth before they found the fish the teeth belonged to. The teeth were so ubiquitous\u2014they showed up on every continent\u2014 that scientists initially thought they were separate creatures, which they called conodonts. However, 150 years later, researchers discovered fossils of a fish with conodonts arranged as teeth.&nbsp;<\/p>\n\n\n\n<p>The primitive fish probably developed teeth so it could consume other creatures with hard exoskeletons. As more creatures developed teeth with hydroxyapatite, other fish used the development mechanism to make bone-like material to serve as armor against predators.<\/p>\n\n\n\n<p>Fish called <em>ostracoderms<\/em> had a shield of bone protecting their head, which was composed of the pulp-enamel tissue that human teeth are made of and helps answer the question &#8220;why do humans have teeth?&#8221; <\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Beyond Teeth<\/strong><\/h4>\n\n\n\n<p>While teeth provided new ways of eating and new diets, they\u2019re also important because <strong>as animals evolved, the process for making teeth was adapted to create other body features<\/strong>. To make teeth, two layers of tissue interact\u2014the layers fold and the outer layer becomes enamel and the inner layer becomes dentine and pulp.<\/p>\n\n\n\n<p>The same two-layer process is also the mechanism for developing other structures within skin, such as hair, fur, scales, feathers, and mammary glands. The key is that in all cases, two layers of tissue fold and both layers secrete proteins that build the organ. It\u2019s like a factory assembly-line process that can be repurposed to produce different things.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why do humans have teeth? How did our teeth develop, and why do we need them? The answer to the question &#8220;why do humans have teeth&#8221; might surprise you. Our teeth evolved over time, partly from our ocean ancestors. Scientists can trace back why humans have teeth to our early ancestors. So why do humans have teeth? Keep reading to find out.<\/p>\n","protected":false},"author":5,"featured_media":17585,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[15,16],"tags":[149],"class_list":["post-17560","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-education","category-health","tag-your-inner-fish","","tg-column-two"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.3 (Yoast SEO v24.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why Do Humans Have Teeth? Evolution Can Tell Us - Shortform Books<\/title>\n<meta name=\"description\" content=\"Why do humans have teeth? The answer is complicated. 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