Why does a person have 32 teeth?

Why does a person have 32 teeth?

why we have 32 teeth 🦷

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answers (2)

Answer 1
June, 2021

It's strange that such a question lacks a full-fledged answer. Links to the material used at the end of the answer.

Let's start with the fact that: "Who said that a person has 32 teeth"?

A person has exactly as many teeth as he has. Should we count implants, prostheses and so on as teeth? Should we count all the teeth that can simultaneously exist in the jaw: milk and permanent erupting teeth along with them?

What about polydontics, which is expressed in the presence of supernumerary teeth in a person?

In particular, in 2014 alone, 80 and even 232 teeth were removed. [1]

Now let's correct the question at the expense of the human norm and everything will fall into place.

Normally, an adult has from 28 to 32 teeth. [2]
Absence of third molars is normal. [2]
Also, the "wisdom teeth" themselves are the subject of controversy about whether they are an atavism or not. Remember your trip to the dentist, you probably heard a proposal to remove third molars from a therapist, although they may be absolutely healthy. This is due to the fact that often their growth is carried out incorrectly and leads to unpleasant consequences for soft tissues, adjacent teeth, or in general the entire dentition.

In a temporary bite * there are 8 incisors, 4 canines and 8 molars - a total of 20 teeth. [2]
* There are milk and permanent teeth - temporary and permanent bite, respectively. [2]

Ie for children the norm is 20 teeth.

Man, like other vertebrates, is built according to the principle of bilateral (bilateral) symmetry *. [3]
*> Bilateral symmetry (bilateral symmetry) - mirror reflection symmetry, in which an object has one plane of symmetry, relative to which its two halves are mirror symmetric. [4]

In animals, the appearance of bilateral symmetry in evolution is associated with crawling along the substrate (along the bottom of the reservoir), in connection with which the dorsal and abdominal, as well as the right and left halves of the body appear. In general, among animals, bilateral symmetry is more pronounced in actively mobile forms than in sessile ones. Bilateral symmetry is characteristic of all fairly highly organized animals, except for echinoderms. [4]

Further, after we have determined that a person has bilateral symmetry and briefly found out what caused this. It should be noted that a person has an upper and lower jaw. For the most effective grinding and chewing of food, the number of teeth in the upper and lower dentition is the same (and it coincides not only quantitatively, but also qualitatively), but has differences in size and shape, so that the bite is correct, most effective and designed to perform its function. Therefore, dentists also quantitatively divide all teeth by 4, and not 2, as described in another answer. Symmetry + upper and lower jaw - two planes for division. 8 * 4 = 32 for an adult, 5 * 4 = 20 for a child.

SpecialThe value of the human diet is omnivorous. This determines the specific - complete - set of teeth: incisors, canines, premolars (small molars) and molars (molars). [5]

The number, shape and other features of our teeth are due to evolutionary development, which, by the way, never stops. [5]

The initial number of teeth in placental mammals is 44. [6]

Modern birds also lack teeth, but they had fossil forms (hesperornis). In 2006, a successful experiment was carried out to activate genes responsible for the formation of teeth in domestic chickens, as a result of which chickens with teeth were obtained. [6]

In accordance with this, we can assume that the number of teeth in a person, if the modern way of life of mankind does not change dramatically and dramatically, of course, will only decrease. But I suppose if a person continues to remain omnivorous, then the number of teeth of an adult will not decrease below the number of 16 (20) teeth.

From personal experience, I will say that I have a friend who was removed by 7 molars, since they interfered with the rest of the teeth fully in the jaws, what can we say about the 8th.
So, the individual characteristics of the organism also affect here, I think, the size of a person (in particular, the head), as well as its proportions, which affect the size of the jaws. If the average size of the teeth remains unchanged and the rest of the proportions decrease, it will lead to a "case with a friend" and a decrease in the teeth required for the individual. up to 32 teeth: the reason is in the evolution of animals that crawled along the bottom, and in the evolution of man as a species.

  1. ru.wikipedia.org
  2. ru.wikipedia.org
  3. "Human Anatomy" edited by MR Sapin. Volume 1.
  4. ru.wikipedia.org
  5. po4emu.ru
  6. ru.wikipedia.org
Answer 2
June, 2021

It's not about quantity. The point is what each tooth is for. The front teeth are responsible for biting off food (cutting teeth). Fangs in order to tear food and hold the victim so that it does not escape (that is, meat, nature gave them to us for meat, we are predators, not herbivores, it so happened). The back teeth, which on the cheeks are chewing teeth, are needed so that food gets into the stomach, as soft as possible and digested easily. 16 on the right, 16 on the left is for symmetry, nature loves symmetry. And yet, ideally we have 32 teeth, because wisdom teeth grow after 16-20 years, complementing this figure of 32 teeth. And not all of them grow.

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