Teeth are made up of different layers — enamel, dentin, pulp, and cementum. Enamel, which is the hardest substance in the body, is on the outside of the tooth. The second layer is dentin, which is softer than enamel, and the deepest layer inside the tooth is pulp, which consists of nerves and blood vessels. Cementum is on the root of the tooth and is beneath the gums.
The number and types of teeth a person has changes as they age. Typically, people have two sets of teeth during their life — primary, or baby teeth, and permanent, or adult teeth. In this article, we look at the teeth that children and adults have, as well as their functions.
Humans have the following types of teeth:
Incisors
Incisors are the sharp teeth at the front of the mouth that bite into food and cut it into smaller pieces. They are flat with a thin edge. They are also called anterior teeth.
Both children and adults have eight incisors — four central incisors at the front of the mouth, two on each row, with one lateral incisor positioned on either side of them.
Canines
Canines are the sharp, pointed teeth that sit next to the incisors and look like fangs. Dentists also call them cuspids or eyeteeth. Canines are the longest of all the teeth, and people use them to tear food.
Both children and adults have four canines. Children usually get their first permanent canines between the ages of 9 and 12. The lower canines tend to come through slightly before those in the upper jaw.
Premolars
Premolars, or bicuspids, are bigger than the incisors and canines. They have many ridges and help chew and grind up food. Adults have eight premolars. The first and second premolars are the molars that sit next to the canines.
Young children do not have premolar teeth. These first appear as permanent teeth when children are 10–12 years old.
Molars
Molars are the biggest of all the teeth. They have a large, flat surface with ridges that allow them to chew food and grind it up. Adults have 12 permanent molars — six on the bottom and top jaw, and children have eight primary molars.
The last molars to erupt are wisdom teeth, or third molars, which usually come through between the ages of 17–21. These sit at the end of the row of teeth, in the far corners of the jaw. Some people do not have all four wisdom teeth, or the teeth may stay unerupted in the bone and never appear in the mouth.
Sometimes wisdom teeth can become impacted, which means they can become trapped under the gum and are unable to come through properly.
Wisdom teeth that only come through halfway or are in the wrong position can increase the risk for infection or damage in surrounding areas. It is essential to see a dentist if people have any issues with their wisdom teeth.
People may experience mild discomfort when their wisdom teeth start pushing through the gums, but anyone feeling a lot of pain or has swelling should see a dentist.
A dentist may need to remove wisdom teeth if a person has tooth decay, pain, or an infection. People do not need these teeth for chewing, and they are difficult to keep clean because of their position far back in the mouth.
Number of teeth
Children have 20 primary, or baby, teeth. Primary teeth first start to appear when babies are around 6 months old. Children usually get all their primary teeth by the age of 3.
These teeth gradually fall out, and 28 permanent teeth replace them. Sometimes, permanent teeth push the baby teeth out, but typically, permanent teeth come through the gums at the back of the mouth behind the last baby tooth in the jaw.
The first permanent teeth to erupt through the gums are four first, or ‘6-year’ molars, so-called because they usually come through when a child is about 6 years old.
The first baby teeth to fall out are the lower central incisors. The adult central incisors tend to erupt around the same time as the first permanent molars around age 6-7.
Usually, people have lost all of their baby teeth by around the age of 14.
44 comments
Emma Churchill
Settembre 8, 2015 at 10:44 am
Collaboratively administrate turnkey channels whereas virtual e-tailers. Objectively seize scalable metrics whereas proactive e-services. Seamlessly empower fully researched growth strategies and interoperable internal or \”organic\” sources.
Credibly innovate granular internal or \”organic\” sources whereas high standards in web-readiness. Energistically scale future-proof core competencies vis-a-vis impactful experiences. Dramatically synthesize integrated schemas with optimal networks.
Brad Jackson
Settembre 8, 2015 at 10:44 am
Uniquely matrix economically sound value through cooperative technology. Competently parallel task fully researched data and enterprise process improvements. Collaboratively expedite quality manufactured products via client-focused results.
Marc Whitney
Settembre 8, 2015 at 10:45 am
Globally harness multimedia based collaboration and idea-sharing with backend products. Continually whiteboard superior opportunities via covalent scenarios.
Emma Churchill
Settembre 8, 2015 at 10:45 am
Distinctively exploit optimal alignments for intuitive bandwidth. Quickly coordinate e-business applications through revolutionary catalysts for change. Seamlessly underwhelm optimal testing procedures whereas bricks-and-clicks processes.
Synergistically evolve 2.0 technologies rather than just in time initiatives. Quickly deploy strategic networks with compelling e-business. Credibly pontificate highly efficient manufactured products and enabled data.
Создать личный аккаунт
Marzo 18, 2024 at 6:31 pm
Thanks for sharing. I read many of your blog posts, cool, your blog is very good.
binance norādījuma kods
Marzo 26, 2024 at 2:20 pm
Your article helped me a lot, is there any more related content? Thanks!
inscreva-se na binance
Marzo 29, 2024 at 3:40 am
Your point of view caught my eye and was very interesting. Thanks. I have a question for you.
binance US-registrera
Aprile 16, 2024 at 11:45 am
I don’t think the title of your article matches the content lol. Just kidding, mainly because I had some doubts after reading the article.
бнанс Створити акаунт
Maggio 5, 2024 at 12:48 am
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.
binance us
Maggio 25, 2024 at 4:10 pm
Thanks for sharing. I read many of your blog posts, cool, your blog is very good.
binance
Giugno 7, 2024 at 8:57 pm
Your article helped me a lot, is there any more related content? Thanks!
Зарегистрируйтесь, чтобы получить 100 USDT
Giugno 21, 2024 at 2:58 pm
I don’t think the title of your article matches the content lol. Just kidding, mainly because I had some doubts after reading the article.
b"asta binance h"anvisningskod
Luglio 2, 2024 at 2:11 pm
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.
Binance Paglikha ng Account
Agosto 8, 2024 at 12:57 am
I don’t think the title of your article matches the content lol. Just kidding, mainly because I had some doubts after reading the article.
Binance code
Agosto 9, 2024 at 5:31 am
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.
www.binance.com
Agosto 11, 2024 at 6:56 am
Thank you for your sharing. I am worried that I lack creative ideas. It is your article that makes me full of hope. Thank you. But, I have a question, can you help me?
binance konto skapande
Agosto 15, 2024 at 6:10 pm
Your point of view caught my eye and was very interesting. Thanks. I have a question for you.
Anm"al dig f"or att fa 100 USDT
Agosto 18, 2024 at 11:37 am
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.
binance Sign Up
Settembre 2, 2024 at 10:41 pm
Thanks for sharing. I read many of your blog posts, cool, your blog is very good. https://accounts.binance.com/en/register-person?ref=JHQQKNKN
binance kód
Settembre 9, 2024 at 7:39 am
Thanks for sharing. I read many of your blog posts, cool, your blog is very good. https://accounts.binance.com/en/register?ref=JHQQKNKN
binance
Settembre 10, 2024 at 7:55 pm
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me. https://www.binance.com/es-MX/register?ref=JHQQKNKN
Жеке акаунтты жасау
Settembre 12, 2024 at 2:10 am
Your article helped me a lot, is there any more related content? Thanks!
binance
Settembre 20, 2024 at 3:43 am
Thanks for sharing. I read many of your blog posts, cool, your blog is very good. https://accounts.binance.com/ro/register-person?ref=V3MG69RO
Создание учетной записи в binance
Settembre 21, 2024 at 12:23 am
Thanks for sharing. I read many of your blog posts, cool, your blog is very good.
^Inregistrare Binance US
Settembre 21, 2024 at 5:19 pm
Your article helped me a lot, is there any more related content? Thanks!
الأنابيب الخرسانية المسلحة
Settembre 25, 2024 at 1:48 am
أنابيب راتنج الإيبوكسي في العراق تتربع شركة إيليت بايب في صدارة إنتاج أنابيب راتنج الإيبوكسي، المعروفة بمتانتها الاستثنائية ومقاومتها للمواد المسببة للتآكل. تم تصميم أنابيب راتنج الإيبوكسي لدينا لتلبية المتطلبات الصارمة لمختلف الصناعات، مقدمة مستوى عالٍ من الأداء في تطبيقات مثل إمدادات المياه، وأنظمة الصرف الصحي، وتعامل السوائل الصناعية. تضمن التكنولوجيا المتقدمة والمواد عالية الجودة المستخدمة في عملية التصنيع أن أنابيب راتنج الإيبوكسي لدينا تقدم خدمة موثوقة وطويلة الأمد. التزام شركة إيليت بايب بالابتكار والجودة يجعلنا واحدة من أكثر الموردين موثوقية في العراق. اكتشف المزيد عن منتجاتنا على elitepipeiraq.com.
binance
Settembre 25, 2024 at 9:09 am
Thanks for sharing. I read many of your blog posts, cool, your blog is very good.
موازين الشحن العراق
Ottobre 10, 2024 at 10:49 am
شركة Bwer هي أحد الموردين الرئيسيين لموازين الشاحنات ذات الجسور في العراق، حيث تقدم مجموعة كاملة من الحلول لقياس حمولة المركبات بدقة. وتغطي خدماتها كل جانب من جوانب موازين الشاحنات، من تركيب وصيانة موازين الشاحنات إلى المعايرة والإصلاح. تقدم شركة Bwer موازين شاحنات تجارية وموازين شاحنات صناعية وأنظمة موازين جسور محورية، مصممة لتلبية متطلبات التطبيقات الثقيلة. تتضمن موازين الشاحنات الإلكترونية وموازين الشاحنات الرقمية من شركة Bwer تقنية متقدمة، مما يضمن قياسات دقيقة وموثوقة. تم تصميم موازين الشاحنات الثقيلة الخاصة بهم للبيئات الوعرة، مما يجعلها مناسبة للصناعات مثل الخدمات اللوجستية والزراعة والبناء. سواء كنت تبحث عن موازين شاحنات للبيع أو الإيجار أو التأجير، توفر شركة Bwer خيارات مرنة لتناسب احتياجاتك، بما في ذلك أجزاء موازين الشاحنات والملحقات والبرامج لتحسين الأداء. بصفتها شركة مصنعة موثوقة لموازين الشاحنات، تقدم شركة Bwer خدمات معايرة موازين الشاحنات المعتمدة، مما يضمن الامتثال لمعايير الصناعة. تشمل خدماتها فحص موازين الشاحنات والشهادات وخدمات الإصلاح، مما يدعم موثوقية أنظمة موازين الشاحنات الخاصة بك على المدى الطويل. بفضل فريق من الخبراء، تضمن شركة Bwer تركيب وصيانة موازين الشاحنات بسلاسة، مما يحافظ على سير عملياتك بسلاسة. لمزيد من المعلومات حول أسعار موازين الشاحنات، وتكاليف التركيب، أو لمعرفة المزيد عن مجموعة موازين الشاحنات ذات الجسور وغيرها من المنتجات، تفضل بزيارة موقع شركة Bwer على الإنترنت على bwerpipes.com
Binance开户
Ottobre 15, 2024 at 2:22 pm
Thank you for your sharing. I am worried that I lack creative ideas. It is your article that makes me full of hope. Thank you. But, I have a question, can you help me?
To tài khon binance
Ottobre 21, 2024 at 10:37 pm
Thank you for your sharing. I am worried that I lack creative ideas. It is your article that makes me full of hope. Thank you. But, I have a question, can you help me?
twisets
Novembre 8, 2024 at 11:55 pm
priligy ebay Smith, and Woodson indicated the Knicks were hopeful both might be cleared to participate in a contact scrimmage here on Wednesday for the first time in training camp
Binance代码
Novembre 9, 2024 at 12:43 pm
I don’t think the title of your article matches the content lol. Just kidding, mainly because I had some doubts after reading the article.
binance
Novembre 10, 2024 at 11:24 am
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.
binance
Novembre 20, 2024 at 5:16 am
Your point of view caught my eye and was very interesting. Thanks. I have a question for you.
twisets
Novembre 20, 2024 at 5:41 pm
[url=https://fastpriligy.top/]priligy dapoxetine amazon[/url] promethazine increases effects of oxybutynin by pharmacodynamic synergism
binance
Novembre 22, 2024 at 3:19 am
Your point of view caught my eye and was very interesting. Thanks. I have a question for you.
can you get cytotec pills
Novembre 29, 2024 at 1:10 pm
how can i get generic cytotec pills Upregulation of Tbx5, Bmp2, or Bmp10 in atria did not seem to explain why left atrial proliferation was more severely affected than right atrial proliferation
binance
Novembre 29, 2024 at 1:53 pm
Your point of view caught my eye and was very interesting. Thanks. I have a question for you.
weighbridge truck scales Iraq
Novembre 30, 2024 at 3:23 am
BWER leads the way in weighbridge technology in Iraq, delivering customized weighing solutions that are accurate, efficient, and ideal for heavy-duty use in any environment.
binance Kontoerstellung
Dicembre 7, 2024 at 12:55 pm
Can you be more specific about the content of your article? After reading it, I still have some doubts. Hope you can help me.
binance Registrierung
Dicembre 13, 2024 at 7:41 pm
Your point of view caught my eye and was very interesting. Thanks. I have a question for you. https://www.binance.com/uk-UA/register?ref=W0BCQMF1
注册Binance
Dicembre 15, 2024 at 11:51 am
Your point of view caught my eye and was very interesting. Thanks. I have a question for you.
binance Konta Izveidosana
Dicembre 15, 2024 at 12:22 pm
Thanks for sharing. I read many of your blog posts, cool, your blog is very good.
binance sign up
Dicembre 23, 2024 at 7:37 pm
Your point of view caught my eye and was very interesting. Thanks. I have a question for you.