How many teeth do we have?
How many teeth do we have?
Table of Contents

Exactly how many teeth do we have? What is the difference between baby teeth and adult teeth?

An adult typically has a total 28 to 32 teeth. On the other hand, children from 3 to 7 years old have 20 teeth.

What are Teeth?

Teeth are known as hard appendages located in the oral cavity whose main function is to grind and tear food.

It has a structure like hard bone tissue that is firmly embedded in cavities in the jaw frame. Each tooth will have two main parts: the body (the part that can be seen inside the mouth) and the foot (the part that plugs into the gums and jawbone).

The roots are often longer than the crowns, especially the incisors have only one root and the rest of the teeth will have two or three roots.

The most important structural element of teeth is calcified tissue called dentin, which resembles bone and also contains living cells.

The outer layer of dentin is covered with enamel, which is an extremely hard tissue and does not cause sensation when touched. The root part of the tooth is covered with a layer of tooth bone with properties similar to the dentin layer to help keep the tooth fixed in the cavity on the jaw frame.

In the middle of the tooth there will be a hollow cavity filled with sensitive connective tissue called pulp. This part of the pulp extends from the crown to the end of the root, at each root there will be an opening at the deepest position in the jawbone. Through this opening, small blood vessels and nerves can enter the spinal cavity.

How Many Types of Teeth Do We Have and Functions?

The teeth are small, hard organs located in the sockets of the jaw bones, which are very hard. the jaws.

The part anchored in the jawbone is known as the root, while the crown is the visible part of the tooth that lies outside the gingiva.

Teeth play a very important role in the digestion process. They are responsible for cutting, tearing and grinding food.. With the help of saliva and due to the action of the tongue, they form a small ball that will pass into the stomach after swallowing, starting the digestion process.

There are typically 32 adult teeth. So, how many types of human teeth are there and what are the functions of each type?

Specifically, human teeth are divided into 4 groups, each group has a separate function:

Eight Incisors

Incisors occupy the front-most part of your mouth. Sometimes people call them front teeth, and they’re the types of teeth you’ll first see in a teething infant. Usually, there are eight incisors, four in the lower jaw and four in the upper jaw.

The teeth grow in front of the jaw, easily visible when smiling and talking. The front teeth are shaped like a shovel, the biting edge is very sharp and sharp.

The main function of the incisors is to bite and tear food into small pieces. They cut foods into smaller pieces before your tongue and other teeth pass them towards the back of your mouth for proper chewing and swallowing.

Four Canines

The canine teeth are the next set that appears immediately after incisors. Humans usually have four canines: two on the top jaw, and two on the bottom jaw.

The canines are sharp and pointed. They help in cutting and tearing food. Additionally, the shape of canines enables them to control rows of your teeth to ensure that they slide smoothly without clashing when you move your jaw.

Eight Premolars

The premolars occupy the space immediately after the canines and just before the molars. An adult has eight premolars, four in the upper jaw and four in the lower jaw.

The premolars have the main function of tearing and crushing food.

The grinding process begins in the premolars before the food gets to the molars for thorough grinding and chewing. Some people refer to premolars as transitional teeth, given that they direct food particles from your canines to the molars for thorough chewing.

Twelve Molars (the number inclusive of 4 wisdom teeth)

Molars occupy the back of your mouth and there are typically 12 of them (this includes four wisdom teeth). Molars are large, enabling them to chew and grind food. Each of your jaws (left lower, left upper, right lower, and right upper) has three molars.

They’re marked as the first, second, and third molars. The third molar at each side of your jaw is wisdom teeth. They sit at the farthest back of your mouth and erupt last (between 18 and 25 years).

Large molars have complex shapes, large chewing surfaces, large and wide areas.

The main function of molars is to chew and grind food with great chewing force.

They’re typically painful and often have to be removed, especially if they erupt sideways or partially. Likewise, some people never develop wisdom teeth.

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How Many Teeth Do Kids Have?

How Many Teeth Are in your Mouth: Children and Adults
How Many Teeth Do Children Have

Infant Teeth Under Their Gums at Birth

We cannot see the teeth of a newborn baby. We think that the children's teeth do not have teeth, but actually the tooth buds are there and the "buds" are hiding inside their gums.

In rare cases, genetic birth defects, hormonal irregularities, and certain bone and skin diseases can result in tooth abnormalities or even missing teeth.

Timeline: Children Teething

Although the age at which children start teething can vary widely, most children start teething around six months of age. Infant teeth typically emerge in the following order:

The baby's first teeth will emerge on the arch when the baby is 6 months old. Then, over time, the teeth will fully grow until there are 20 for 2 jaws.

Around the age of four, you may notice spaces developing between the primary teeth as the bones in your child’s face start to grow. This is perfectly normal and helps to create the space necessary for the larger permanent teeth to emerge.

By the time a child is 5 years old, the process of replacing baby teeth with permanent teeth will begin and children have 20.

Upper Teeth of Kids

• Central incisor: 8 to 12 months

• Lateral incisors: 9 to 13 months

• First molars: 13 to 19 months

• Canines: 16 to 22 months

• Second molars: 25 to 33 months

Lower Teeth of Kids

• Central incisor: 6 to 10 months

• Lateral incisors: 10 to 16 months

• First molars: 14 to 18 months

• Canines: 17 to 23 months

• Second molars: 23 to 31 months

The back baby teeth are usually not lost until age 10-12 years. This means it is even more important to take care of the back baby teeth as they are not changed until the kids are in their early teens.

How Many Teeth Do Adults Have?

How Many Teeth Are in your Mouth: Children and Adults
How Many Teeth Do Adults Have

Do you know how many teeth we have as adults? Older adults have a greater number of teeth than children.

It seems that there are too many teeth in our mouth? Yes, but don't worry, our jaws will grow to accommodate these teeth and give us a set of teeth with beautiful smiles.

When you’re born, permanent teeth begin developing in your jaws and keep growing until 21 years. You’ll probably have 32 permanent teeth (16 in the upper jaw, 16 in the lower jaw).

An adult human typically has 32 teeth if they never got their wisdom teeth removed, and 28 if they did.

Most people have 28 teeth (14 in the upper jaw, 14 in the lower jaw) after removing their wisdom teeth. Likewise, other peoples’ wisdom teeth never erupt.

As a result, you don’t have to sweat it out if you have fewer teeth (28 instead of 32).

Some teeth fall victim to decay, reflux-related erosion, or other conditions. Tooth agenesis is a rare genetic disorder wherein some teeth are simply missing. Other people have extra chompers, known as supernumerary teeth.

Most people have their permanent adult dentition by the time they reach adolescence. The total number of permanent teeth always includes wisdom teeth.

Adults have a total of 32 teeth. These are distributed in 8 incisors, 4 canines, 8 premolars and 12 molars.

What is the Structure of Teeth and Teeth Made Of?

How Many Teeth Are in your Mouth: Children and Adults
Structure of the Tooth

The teeth are made up of different are made up of different tissues, and they are divided into the crown and root. While the root is not visible because it is the part that is covered by the gum and the maxillary bone, the crown plays a fundamental role in the chewing process.

Teeth are made up of 3 main layers: enamel, dentin and pulp, in which:

Dental Enamel

Enamel is the hardest tissue and also the one with the highest percentage of inorganic salts (96%) in the body's solid tissues. Besides, there are some ingredients such as carbonate salts, MgCO3 (accounting for 2% of inorganic substances), a small amount of chloride, fluoride, sodium and potassium sulfate. Organic ingredients account for 1% but mainly lysine arginine (amino acids found in karetin), amino acid histidine.

The enamel layer is hard, brittle, resistant to X-rays, in the normal state it will be translucent, thin, and well absorbed by lime. If we look through the enamel, we will see the dentin underneath, so the teeth will have a slightly yellowish white color of the ivory layer. When new teeth erupt, the young enamel layer will contain up to 30% organic matter and water. As the glaze ages, the inorganic matter also increases as the crystals are arranged closer together. On the other hand, it also gradually infiltrates major trace elements such as fluorine, causing apatite to convert into fluoroapatite.

To maintain the health of teeth, enamel plays a very important role. That is why we must take care of it and maintain its integrity throughout life.

The shade of the teeth depends on the stains that form on the enamel.


The dentin is the main mass in the crown of the tooth that has the function of covering and protecting the pulp. Under normal conditions it will not be exposed but is completely covered by enamel and bone. On the other hand, this is also an organization that is less solid and elastic than enamel, and is not as brittle or fragile as enamel.

The natural ivory layer is pale yellow, highly elastic, porous and permeable. Up to 70% of the composition is inorganic, in which mainly phosphate 3 calcium apatite 32H2O. Also contains calcium carbonate, fluoride and magnesium, organic ingredients and water accounting for 30% (mainly collagen colloid).

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Dental Pulp

The pulp is a mass of tissue capable of connecting blood vessels located in the cavity between the teeth called the pulp cavity. The shape of the pulp is similar to the outer shape of the tooth, including chamber pulp and root pulp. In permanent teeth, the volume of the pulp cavity depends on the shape, size of the tooth and the number of canals. In each root, there will usually be a root canal.

Organizations of the dental pulp include:

• Cell composition: Consists of odontoblasts, fibroblasts, undifferentiated cells and guard cells, which perform different functions.

• Composition of fibers and basic substances: Consists of fiber mesh, filaments and collagen fiber bundles.

• Pulp blood vessels: The main blood vessels enter the pulp through the apical foramen, in addition, they can also enter and exit through the accessory canals, especially in the bifurcation and tripartite areas of multi-rooted teeth.

• Veins: The part that goes to the root of the tooth to go out, their diameter will be smaller and the number will be less. As a result, the circulation in the marrow slows down, which is beneficial for the normal metabolism in the pulp.

Instructions on How to Take care of and Clean your Teeth Regularly and Properly

How Many Teeth Are in your Mouth: Children and Adults
How to Take care of and Clean your Teeth

After understanding the problem of how many teeth people have, you should pay attention to taking care of your teeth in a scientific way. Because proper oral care will help keep teeth healthy, limit pests, infections.

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Clean and brush teeth properly

Proper brushing will help keep your mouth fresh, clean, and prevent tooth decay. Every day, you should beat 2-3 times after eating, at least 2 minutes each time. Note that you should use a soft toothbrush and suitable toothpaste.

In addition, you should use dental floss to clean food residues that stick to your teeth after eating. Limiting the use of bamboo toothpicks is very easy to cause damage to teeth and gums. Should combine the use of mouthwash and cleaning the mesh surface to limit the bacteria residing.

Teeth with health and beauty

How many teeth do humans have? How to take care of your teeth? To check your oral health, you need to have regular check-ups every 3-6 months. You should also take tartar, have a general examination of your teeth as directed by your dentist to prevent tooth decay and gingivitis.

Diet has a great influence on a person's oral health. You should add green vegetables, fresh fruits in meals, avoid using foods that are too hot, cold, and spicy.

In addition, you should not use alcohol, stimulants and alcohol that damage tooth enamel, causing teeth to discolor.

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