How many teeth should be replaced?

Nowadays, many families have only one baby. Many parents pay meticulous attention to their children, but some people lack the necessary knowledge about their children's growth. Especially when the children are changing teeth, some parents don't know how many teeth their children should change? We don’t even know at what age children will start to change their teeth. So, how many teeth should children replace? Let me introduce to you some issues related to tooth replacement!

Tooth replacement is the process of deciduous teeth falling out and permanent teeth growing in. During the growth and development process, there is a permanent tooth germ under the root of each deciduous tooth, which gradually develops and grows. During the eruption of the permanent tooth, on the one hand, it compresses the alveolar bone between the deciduous tooth root and the permanent tooth germ, and through the action of osteoclasts, the bone is absorbed and thinned until it is completely absorbed; on the other hand, it directly compresses the deciduous tooth root, causing the deciduous tooth root to gradually absorb, become shorter and shorter, until it disappears completely. Then the deciduous teeth begin to fall out and the permanent teeth gradually grow in.

Normally, at the age of 6 to 7, the deciduous central incisor (central front tooth) of the mandible begins to shake and fall out, and soon the permanent central incisor grows in its place; at the same time, the first molar grows behind the second deciduous molar. After that, the other teeth were replaced one after another. The permanent monocuspids and bicuspids can only grow out after the deciduous teeth in the same position fall out. By the age of 12 to 13, all the deciduous teeth have fallen out and have been replaced by permanent teeth. After that, permanent teeth will grow separately: the second molar will grow behind the first molar at the age of 12 to 14, and the third molar will grow after the age of 18. It is normal for some people to not have third molars.

Generally speaking, each person can grow two sets of teeth in his or her lifetime. The first 20 deciduous teeth (baby teeth) to grow out are deciduous teeth. Deciduous teeth begin to erupt at about six months old and are fully grown at about 2 and a half years old. Deciduous teeth fall off gradually between the ages of 6 and 12 and are replaced one by one by permanent teeth.

The normal range of the number of permanent teeth is 28 to 32, but each person's situation varies. Less than 28 teeth are congenitally missing permanent teeth or impacted teeth in the jawbone (impacted teeth); more than 32 teeth are supernumerary teeth (also called extra teeth), the number of supernumerary teeth varies, and the shape is special.

As for the phenomenon of the third set of teeth, there have been reports of it, but its probability in humans is only 1/1 million.

The order and timing of tooth replacement are roughly as follows:

Number of teeth and time of tooth replacement

4 central incisors 6-7 years old

4 lateral incisors 8-9 years old

First pair of canines 4 at 10 years old

Single canine 4 11 years old

Second canines 4 12 years old

First molars 4 at age 6

4 second molars at 13 years old

Generally speaking, children begin to change their teeth when they are five or six years old, so as parents, we must pay more attention to our children. Because children's teeth are related to their lives, we should strengthen the care of children during the period of tooth replacement. When there is a problem with the teeth, we should take the children to see a doctor in time. It is very important for children to have healthy and white teeth.