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The names of the teeth

The incisors

The incisor (derived from the term incision, from the Latin incisio, incise) is a type of tooth, located in the oral cavity and used to cut food.

The human dentition has eight incisors distributed as follows:

  • Two upper central incisors
  • Two upper lateral incisors
  • Two lower central incisors
  • Two lower lateral incisors

They constitute the dental arches located at the front of the maxillary and the mandible, respectively corresponding to the upper and lower jaws.

The incisors are the first visible teeth and have an important role in dental esthetics. It is they who are at the forefront of the physical traumas of childhood.

The term “teeth of happiness” is used to denote the distance between the two upper medial incisors. This gap is actually called “diastema”.

The central and lower lateral incisors are often substantially the same.

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The canines

Located in the oral cavity and at the angle of the dental arch, the canines are 4 in number, distributed as follows:

  • two upper canines, on both sides of upper incisors
  • Two lower canines, on both sides of the lower incisors.

Canines are sharp teeth with two sharp edges. Thanks to this and their sharp shape, the canines are used to shred sturdier foods like meat. This is a different tooth than the other teeth since the beginning of the mammalian line.

All carnivores have a canine that is heavily fanged, but the ancestor common to all current carnivore families, the Miacis, a 60-million-year-old prehistoric mammal, had 44 teeth and poorly developed canines.

These teeth are sometimes called “teeth of the eye” because their very long roots go back to the area of ​​the eye. This is why an infection in the upper canines can sometimes be transmitted to the orbital region.

The premolars

The premolar (molar, from the Latin molaris, from mola, meaning millstone) is a type of tooth that is mainly used to grind food.

The premolars are positioned between the canines, located at the front of the dental arch, and the molars, located at the back. The human dentition has eight definitive premolars distributed as follows:

  • Four upper premolars, two of which are on each upper half-jaw.
  • Four lower premolars, two of which are on each lower half-jaw.

Premolars are teeth with a slightly cubic appearance, forming a crown that usually has two rounded tubercles.

Molars

The molar (from Latin molaris, derived from mola, meaning millstone) is a type of tooth that is used primarily to grind food.

Located in the oral cavity, the molars are the most posterior teeth of the dental arch. The human dentition has 12 permanent molars distributed as follows:

  • Six upper molars, three of which are on each upper half-jaw and follow the upper premolars.
  • Six lower molars, three of which are on each lower half-jaw and follow the lower premolars.

The third molars, called wisdom teeth, are often a source of problems and pains. They can particularly cause infections or displacements of the dentition.

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Here is the calendar of physiological eruption of permanent teeth

Lower teeth

– First molars: 6 to 7 years

– Central incisors: 6 to 7 years

– Lateral incisors: 7 to 8 years

– Canines: 9 to 10 years old.

– First premolars: 10 to 12 years old.

– Premolar seconds: 11 to 12 years.

– Second molars: 11 to 13 years.

– Third molars (wisdom teeth): 17 to 23 years old.

Upper teeth

– First molars: 6 to 7 years

– Central incisors: 7 to 8 years

– Lateral incisors: 8 to 9 years

– First premolars: 10 to 12 years old.

– Premolar seconds: 10 to 12 years.

– Canines: 11 to 12 years old.

– Second molars: 12 to 13 years old.

– Third molars (wisdom teeth): 17 to 23 years old.

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