Are human teeth useless, and why do humans have teeth?

How are human teeth made? There are two sets of teeth in a person's life, the first is called baby teeth, and the second is called permanent teeth. There are a total of deciduous teeth, including deciduous central incisors, deciduous lateral incisors, deciduous cuspids, and deciduous molars.

There are a total of permanent teeth, including central incisors, lateral incisors, caninees, bicuspids, and molars. Each tooth can be divided into three parts, the part exposed in the mouth is called the crown, the part buried in the alveolar bone is called the root, and the junction between the root and the crown is called the neck. Each tooth is made up of four types of tissue:

Human tooth ( ) enamel: covers the outermost layer of the crown and is the hardest tissue in the human body. Human teeth ( ) dentin:

It is the hard tissue that makes up the body of the tooth. Human tooth ( ) cementum: is the hard tissue that covers the outer layer of the tooth root.

Human tooth ( ) pulp: The center of the tooth is a cavity containing the soft tissue with nerve vessels, that is, the pulp. The cavity containing the pulp is called the pulp cavity, where the part in the crown is called the pulp chamber and the part in the root canal is called the root canal.

The pulp is connected to the nerves and blood vessels within the jaw through the apical foramen. The tissues around the teeth are called periodontal tissues and include the root ligament, alveolar bone, and gums. Their main function is to support the tooth to be firmly implanted in the socket.

How do human teeth develop? People have two sets of teeth, baby teeth and permanent teeth, which erupt symmetrically in a certain time and order. There are three stages of tooth eruption and growth:

Stages of deciduous teeth: The eruption time of deciduous teeth is one month after birth, and the number of deciduous teeth is complete at the age of one and a half years. Baby teeth are several months old.

There is a certain sequence in which baby teeth erupt. Children with rickets, malnutrition, cretinism, and congenital stupidity have slow teething and poor teeth. (Mixed tooth stage:.)

At the age of six, the baby teeth fall out one by one, and the permanent teeth gradually erupt and grow, replacing the baby teeth. This stage starts at the age of years and has both baby and permanent teeth. (Permanent tooth stage:

Around the age of age, all the baby teeth are replaced by permanent teeth. Before the age of age, all but the third permanent molars (wisdom teeth) erupt. Adults share a permanent tooth.

A person's permanent teeth do not change for life after they erupt.

Trouble, thanks!

Wisdom teeth are useless and last to grow, and some people don't grow either.

From a medical and evolutionary point of view, teeth have a great effect on mammals, including some fish.

Humans are omnivores, their incisors can chop food, their fangs can tear through animal food, and their molars can grind food. The chewing process is then completed, which is the first step in digestion.

Only the grated food is conducive to swallowing, the second step of the digestive process, and the food can enter the digestive tract.

When food enters the digestive tract, it enters the process of free chemical digestion and mechanical digestion, both of which are conducive to the digestion of ground chyme.

Therefore, teeth are very important for human beings, and the elderly have missing teeth and difficulty chewing, which will also cause malnutrition and accelerate aging.

Hope mine is helpful to you, hope.

Hello, looking at your question, this is a natural evolution, because you have to eat, you have to chew, so you slowly grow teeth.

Teeth are the organs that chew food in humans and higher animals, and are composed of hard bone tissue and enamel, and each tooth is divided into three parts.

The lower part is called the tooth root, the upper part is called the lead crown of the tooth core, and the middle part is called the tooth neck. According to the different parts and shapes, they are divided into incisors, canines, premolars, cavities and molars.

Each person has 32 permanent teeth, and 28 teeth are truly functional.

The arrangement and name of the teeth are calculated from the middle big tooth above us, the first big tooth on the left is called the middle incisor, then the incisor, the canine, the first bicuspid, the second bicuspid, the first molar, the second molar, the last one is called the third molar, commonly known as "wisdom teeth", and some people do not grow this tooth in their lifetime.

Teeth are also known as "teeth". Highly calcified tissues with a certain morphology that have the functions of chewing, aiding speech, and maintaining facial shape. In the human body, there are two teeth in a lifetime, the first one is called "baby teeth", and it is about two years old, a total of 20.

Around the age of six, baby teeth gradually fall out and "permanent teeth" erupt, a total of 32. According to the morphology, it can be divided into incisors, canines, and molars. The function of the incisors is to cut food, the bicuspid teeth are used to mash the food, and the teeth grinding are used to grind the food.

Teeth not only chew food and help with pronunciation, but they also have a great impact on the beauty of the face. Due to the support of the teeth and alveolar bone, the normal shape of the dental arch and the bite relationship will make the face and lips and cheeks appear full. And when people talk and smile, neat and white teeth can show people's health and beauty.

Conversely, if the dental arches are not developed properly, the teeth are arranged out of order, and the face will appear uncoordinated. If too many teeth are missing, the lips and cheeks lose support and become sunken, which can make a person's face look old and thin. Therefore, people often regard teeth as one of the important indicators of bodybuilding.

If you want to have a healthy set of teeth, you must pay attention to dental health and eat more calcium-rich foods. Especially in infancy and early childhood, attention should be paid to dietary choices. Parents should give their children more vegetables that can promote chewing, such as celery, cabbage, spinach, leeks, kelp, etc., which is conducive to promoting the development of the jaw and the alignment of teeth.

Eating vegetables regularly can also increase the content of molybdenum in the teeth, enhancing the hardness and firmness of the teeth. Experiments have shown that the bone density of young children who are anorexic to vegetables and meat is lower than that of children who eat vegetables and meat. Eating vegetables regularly can also prevent tooth decay, because vegetables contain 90% water and some fiber.

When chewing vegetables, the water in the vegetables can dilute the sugar in the mouth, making it difficult for bacteria to grow; Cellulose cleans and cleans teeth. In addition, eating more hard foods is good for the health of your teeth, such as corn, sorghum, beef, dog meat and some nuts such as acorns, melon seeds, walnuts, hazelnuts, etc.