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.
Земляника
24 комментария
Jane2188
07.08.2025 в 08:14
https://shorturl.fm/UscIR
Ruby3340
08.08.2025 в 08:39
https://shorturl.fm/HSNeY
Anastasia2749
08.08.2025 в 11:05
https://shorturl.fm/Mt9Tm
Kaylee1108
11.08.2025 в 23:34
https://shorturl.fm/rVckU
Hailey821
12.08.2025 в 02:17
https://shorturl.fm/HrD44
Phoebe3256
12.08.2025 в 09:48
https://shorturl.fm/5ihsL
Sofia4065
16.08.2025 в 23:10
https://shorturl.fm/p78xJ
Gerard3292
26.08.2025 в 19:34
https://shorturl.fm/ALUU5
Jillian2694
30.08.2025 в 02:51
https://shorturl.fm/R4yrR
Robin2195
30.08.2025 в 23:44
https://shorturl.fm/wrMVs
Angelica2086
01.09.2025 в 09:58
https://shorturl.fm/InhAU
fortunesnakebr
23.12.2025 в 12:57
Fortunesnakebr, alright, let’s see what you got! Heard they got some cool slots. Trying my hand at a few. Fingers crossed! Good vibes so far!. fortunesnakebr
88ppbet
28.01.2026 в 14:44
88ppbet, feels like a lucky number! Hoping for some serious payouts tonight. Tell me if you win big! Check it out at 88ppbet
82jili
28.01.2026 в 14:44
82jili, might give this one a try after work. Hopefully, it has some good bonuses. Wish me luck! Give it a shot at 82jili
gamev3
28.01.2026 в 14:45
Been messing around on gamev3 and it’s pretty neat! They’ve got a good selection of games and the site loads quickly. No complaints here – good for a quick gaming fix. gamev3
rong bach kim .net
16.02.2026 в 01:20
I’ve found that rong bach kim .net on Rongbachkimnet is super helpful. It’s given me an edge, no doubt. Check it out, you won’t regret it: rong bach kim .net.
40winlogin
16.02.2026 в 01:21
Alright, 40winlogin’s got a pretty streamlined login process, which is a huge plus for me. Been playing a few games and so far, so good. Give 40winlogin a look-see 40winlogin.
vswinbet
16.02.2026 в 01:21
Yo, vswinbet’s been treating me well. I like the range of options they have. It’s a bit of alright fun, innit? Might be your lucky break too vswinbet.
phl63+login
05.03.2026 в 15:42
Struggling to find the right PHL63 login page. Finally found it! Sharing it here for you guys: phl63 login. Hope this helps!
7f777
05.03.2026 в 15:43
Okay, 7f777, you have my attention. Decent selection of games and a pretty user-friendly site. Hoping for some good luck here. Fingers crossed! 7f777
x111game
05.03.2026 в 15:43
Just signed up for x111game. Got curious and decided to try it out. The variety of games they have is cool. Hopefully it is fun to play! x111game
bateubetbr
11.03.2026 в 17:09
Bateubetbr, what’s up! I’m trying to find a proper betting platform, and their odds are pretty good. The service look impressive. bateubetbr
g555games
11.03.2026 в 17:09
Hey, look for g555games, great experience and a lot to explore. I can see myself playing for hours. I’m so excited now. g555games
jili56ph
11.03.2026 в 17:10
Alright, jili56ph, you’re on my radar now. Time to see what you’ve got. Fingers crossed for some big wins! Let’s go!. jili56ph