The first teeth of the baby begin to erupt from six months. At the same time, parents will definitely feel this on themselves. The first sign that a child has teething teeth will be profuse salivation. Kids begin to pull very intensively into their mouth everything that comes to hand. The child becomes tearful, irritable and restless, and certainly will not let you sleep at night.
The first molars begin to be visible no earlier than 12 months. First, the upper, and by 19 months, lower teeth will appear. This whole process is very painful and painful for babies, so it is important to carefully and understandingly treat the child, giving him soothing herbal teas.
When molars are cut, molars can be very effective. To do this, they must be massaged gently with clean hands to the child, while slightly pressing. This will not only save your child for some time from discomfort, but also allow the teeth to go through the gum a little faster.
The molars will be replaced by permanent teeth when your child grows up, as they are not at all adapted to chewing hard and dense foods, which, in principle, is not required for babies.
In adults, molars are called molars, they are located in the sixth, seventh and eighth positions of a constant row. The teeth have a dense structure and a characteristic shape for the implementation of chewing function. They replace their predecessors by five or six years of human life, and are distinguished by strength and density.
It should be noted that the so-called "wisdom teeth" can appear at the age of 18 and even after 30 years - there is nothing to worry about.
On the upper jaw, molars have three canals, and on the lower jaw only two. However, there are exceptions, and sometimes dentists can observe the uncharacteristic arrangement of the dental canals and roots.
Each molar has a specific chewing surface, which is represented by tubercles. There can be five and four, depending on the position of the tooth. Most often, only the first molar of the lower jaw can see five tubercles, and all the others - four.
Between the teeth in the oral cavity there is an interdental gap, the width of which can vary.
The structure of the teeth, in general, is similar. Each of them has enamel - this is a special fabric that covers the entire tooth from top to bottom. Also, the tooth can be divided into a crown, a neck and a root.
The molars do not fundamentally differ in structure from the rest, but their mass is much greater than the mass of fangs. Almost all of the crown and root space is occupied by dentin - it is a solid substance that looks like a sponge. Dentin nourishes the entire tooth, as in its tubules pass the nerve endings and small vessels.
In the middle of the tooth there is a cavity that reaches the root itself and ends with a small hole. For each individual tooth root in the jaw there is a special place - a cell in which it is placed. Between the root itself and the notch there is a small space filled with connective tissue, which allows the tooth to stay very tight in the cell. The vessels that feed it and the nerve endings penetrate from the tissue to the tooth - this supports the life of the organ.
All teeth in the oral cavity are located in the form of two arcs having the same structure. In this case, the chewing surfaces of the upper and lower arches should ideally fit each other. The articulation of these surfaces is called the bite.
As for the strength and strength of all teeth in general, the hereditary factor and human nutrition play a large role in this. If there is not enough calcium in the body, then the teeth begin to crumble. There are a number of diseases that provoke tooth loss and brittleness, but to a greater extent, everything depends on the person.