What is the Tooth Number Chart?

Sometimes the complexity of the terminology of the dental discipline, make us to be a little afraid of going to see a dentistry specialist, but if the person spent some time learning what is all about , everything  will seems much simpler than that appeared before. For example understanding the tooth number chart is a great way to start this learning process.

The Universal Numbering System is the way in which the dental professionals in the world understand each other when they refers to a specific tooth and the number chart is the diagram that shows the location and number of each individual  piece.

The chart begins with the number one, which is the utmost in the upper right side, following  to the front of the teeth and then to the opposite side to the back. Then the numbering continues to the lowering left and right, until is finished in the number 32.

Dental Numbering

Wisdom Teeth

#1 (upper right), #32 (lower right)

#16 (upper left), #17 (lower left)

This molar the most of the times erupt when the person is from 17 to 25 years old, and it is located at the back of each dentition quadrant Normally each person have 4 wisdom tooth,but it is also possible to have less none or even more of them. These molars are known for the effect that often have in another , being common that a procedure to extract them is performed to avoid problems with another piece.

Maxillary Second Molar

#2 (upper right),#31 (lower right)

#15 (upper Left),#18 (lower left)

The molar presents 2 kind of tooth. The first is the deciduous that is the name that is used for baby tooth, and permanent which is the designation that is utilized when people is talking about adults tooth. Four cusps can be seen on these molars, 2 near the palate and 2 more next to the cheek.

Maxillary First Molar

#3 (upper right), #30 (lower right)

#14 (upper left), #19 (lower left)

The maxillary first molar  is one of the teeth in charge of the chewing, and its location is on the side of the second molar and in the middle between the face and the aforementioned.

Its lobes are four and are: Distolingual, mesiolingual, distobuccal, and mesiobuccal, A particular characteristic of these molars is that they don’t shows facial progressive depressions.

Maxillary Second Premolar

#4 (upper right),#29 (lower right)

#13 (upper left) ,#20 (lower left)

Located in the upper jaw between the first premolar and the maxillary first molar, the maxillary second premolar is also a tooth that its principal job is chewing. Deciduous maxillary premolars are not existent.

 Maxillary First Premolar

#5 (upper right),#28 (lower right)

#12 (upper left),#21(lower left)

The maxillary first premolar is positioned in the upper jaw between the maxillary canine and the second maxillary premolar. Its main function is ripping, and like canines they support the chewing during mastication.

Maxillary first premolars contain 2 cusps, and one of them, the buccal, can be compared to the tooth of carnivorous animals regarding the sharpness of them.

Baby maxillary premolars don’t, exist and at nearly 11 years old the permanent premolars take the place of the primary, and have to pass about 36 months to be fully developed.

Maxillary Canine

#6 (upper right),#27 (lower right)

#11 (upper left),#22 (lower left)

The location of the maxillary canine is three teeth from the midline of the face  between the maxillary first premolars and the maxillary lateral incisors. Together with the mandibular canines are considered the foundation of the mouth, due that they absorb most of the pressured provoked by the mastication activity. Deciduous canines are almost equal to permanent ones and present only one cusp each.

Regarding  the frontal teeth these are the only that have cusp, and summing the length of the incisal edge and the root,  they are the longest tooth in the whole mouth.

Maxillary Lateral Incisor

#7 (upper right),#26(lower right)

#10 (upper left),#23(lower left)

These teeth are a couple of teeth in the upper jaw which are located between the maxillary canines and the maxillary central incisors. They cut the food helping the chewing function in mastication.

The incisal edge or ridge is the area of the tooth that is used when eating, and the most of the times thee teeth don’t presents cusps. Babies and adults maxillary lateral incisors are practically the same.

Maxillary Central Incisor

#8 (upper right),#25 (lower right)

#9 (upper left),# 24 (lower left)

This is the most exposed tooth in our mouth, and is located in the anterior area of the maxilla next to the middle of the face and the maxillary lateral incisor. They show a unique cusp per tooth and its role is  trimming in the mastication process. Both maxillary central incisors are together in the middle of the face and are the solely kind of tooth that presents this characteristic.

What Are Teeth Made of?

The teeth are made from  different layers which are composed of different elements, and to understand them better let’s revise them more deeply one by one.


Being the visible layer of the four, the enamel is the constituent that have the highest level of minerals in our body, at about 96%.The ends of the teeth have no dentin and in contrary to the most part of it where the color can look from yellow to some tones of gray, the color is  light blue.

The color of the teeth is greatly influenced by materials used underneath the enamel in the restoration process of them, or by the color of dentin, due that the enamel is almost transparent.

The principal mineral component of the substance is hydroxyapatite that is translucent calcium phosphate that varies in thickness depending on the area of the tooth. The attrition rate of enamel is 8 s of 8 micrometers yearly. With no collagen in it, the element presents the following proteins in its growth:  Enamelins, tuftelins, amelogenins, and ameloblastins. These proteins serve as structure help and several more roles for enamel.


The second component of the teeth is a substance called Dentin that is secreted by a living specialized cell named odontoblasts which is part of the outer surface of the dental pulp.

Made of 20% of organic, 70% of inorganic materials and 10% of water this element is the result of a process titled dentinogenesis.

Dentin act protecting the crowns of the teeth, but due that is softer that cementum, it can be affected by cavities more frequently if is not attended timely.

Constituted by a series of collagenous proteins, Dentin is a connective tissue, which is rich in minerals and is positioned between the pulp chamber and enamel. Its dentinal tubules secrete from the pulp cavity to the enamel edge. These dentinal tubules are microscopic channels that are independent without intersection between them. The extents of the teeth determine the length of the channels.

Dental pulp

The center of the tooth is an area named Dental Pulp, which filled with soft connective tissue, also contains other cells, like preodontoblasts, Tlymphocytes, macrophages and fibroblasts. On the border the pulp and dentin, odontoblasts start the beginning of dentin. Nerves and blood vessels that form this tissue go in to the hole at the top of the root.

Tooth Eruption Chart

Baby teeth normally erupt at six months of age, and permanent teeth erupt  at about  six years of age.

Below we can see charts that show when deciduous and permanent teeth erupt in the majority of cases.

The chart shows us that normally the first tooth emerges when the baby is nearly 6 months of age. The sequence of eruption that is frequently seen, starts with the eruption of the pair of bottom incisors, and then continues with the top front dental pieces. Later the process follows its development slowly with the emerging of sets in both sides of the jaws. When the kid is between 2 and  3 years of age, the set of 10 tooth in each jaw should be completed ,and will stay like that until the child reach the age of 6 or 7 years old.

Some of the functions of primary teeth are for example, the support that they give to the kids when they are developing their speech abilities, or that they help to give to the face a proper appearance. Also they keep available the necessary space for the bigger and darker permanent teeth.A little after the kids are 4 years old, the growth of the bones and the jaw begin to make spaces between the deciduous teeth for the eruption of the permanent pieces. Later, from the age of 6 years old the children show a blend of both kind of teeth.

The order of the eruption of permanent teeth is not always the same.In some people, the first permanent teeth to emerge are the incisors and in other are the molars. Normally at 13 years old should have emerged the whole group of 28 permanent tooth, and at 17 to 21 years old the wisdom teeth should appear.

The eruption process even is mostly  predictable, it is not equal for everyone and exception are very common.Some people can have all the 4 wisdom teeth, and some other persons have 3 or even none.Sometimes we can find people that have never had the whole set of 32 teeth.

How To Clean Your Own Teeth Like A Hygienist

If you want an ample healthy life, you cannot avoid thinking on how to take care of your oral hygiene. Even bacteria is present in everyone’s mouth and the majority of them are innocuous, our focus should be in the kind of bacteria that provoke caries, ill gums and several more diseases that make our life more difficult.

For starters the rule of thumb in oral care is that if you want have a nice and healthy mouth you should do a dental checkup at least twice a year, and make of the following procedures a daily routine:

  1. – Brushing: The consensus is that the proper care of the mouth begins with the brushing of your teeth, which should be done two times per day as a minimum. This part of the dental care is important to remove the undesired substances that provoke cavities in your teeth.
  2. – Flossing: If you floss in a daily basis, you are going to remove the bad bacteria and harmful substances from areas of your mouth that you cannot get to when you brush your teeth. This method is done by inserting a tiny string of plastic between your teeth sliding it several times until the area is free of undesired materials.

Healthy Diet: It is a fact that a healthy and well organized diet is going to help enormously to maintain your mouth without mayor complications. The balance of the nutrition that you get daily is going to be the main factor when planning the way that you want care your teeth.The basic components of our teeth are made of minerals and proteins, thus is extremely important to keep the right supply of them to our body.

Teeth Complications

1.- Cavities:

There are several facts that contribute to the appearance of cavities, but the most common causes of them are the ingestion of sweet foods and the lack o oral care through brushing and flossing.The proper care oh the teeth is going to help to avoid more sophisticated treatments like for example root canal therapy.

2.-Gum Disease :

Also named Gingivitis, periodontal disease is an illness that is quite common in adults, and consists in an infection that affects the gums. These kind of problems if not treated timely can cause loose of tooth or evolve to periodontists which besides to be irreparable, is the origin of damages in the structure and the tissues that serve as foundation of the teeth.

3.- Sensitive Teeth:

Dentin hypersensitivity is caused by the tightening and expansion of the teeth when changes in temperature are applied on it. The main symptom that this disease shows is a strong pain when ingesting hot or cold liquid. Originated in microscopic cracks that have been created overtime by these changes in temperature, the pain can make people change their lifestyle and eating habits.

The exposure of the underlying layer of the teeth occurs on the gum line or on the teeth area as such.

Habits that can result in sensitive teeth are for example: Too strong teeth brushing, reflexively teeth grinding, use of harsh toothpaste and many more.

It is important to be aware that some cases of cavities that are still not visible can be confused with sensitive tooth.


At the beginning of these article we talk about of the tooth number chart and then evolved to a more complete analysis of several topics related to it. The overall  subject is ample and complex,but we have tried to synthesized the most important issues that we consider basic for a good teeth care and the quality of life that these involve.