How many baby teeth does a child have?

People will go through the stage of tooth replacement in childhood. After the replacement of deciduous teeth to permanent teeth, there will be no more changes in people's teeth. There are generally 20 primary teeth, and each one will be replaced. Of course, during the process of tooth replacement, many children have the problem of not losing their deciduous teeth, which needs to be dealt with in a timely manner. Next, I will introduce to you the relevant knowledge about children’s tooth replacement!

1. How many baby teeth should children replace?

All 20 baby teeth need to be replaced. Baby teeth begin to erupt at around 6 months old, starting with the front incisors of the lower jaw, and all 20 baby teeth (10 in the upper row and 10 in the lower row) grow out at around 2 and a half years old. Generally, the baby starts to lose teeth at the age of six or seven, following the order in which the baby teeth grow. By the age of 12-13, all baby teeth are replaced by permanent teeth.

2. The order of children's tooth replacement

The first permanent molar, also called the sixth-year molar, grows behind the last deciduous molar at around 6 years old.

The lower central incisors erupt slightly earlier or at the same time. The deciduous lower central incisors fall out around 6 years old and the permanent lower central incisors erupt.

At 7-8 years old, the upper deciduous central incisors fall out, the permanent upper central incisors erupt, the lower deciduous lateral incisors fall out, and the permanent lower lateral incisors erupt;

At 8-9 years old, the deciduous upper lateral incisors fall out and the permanent upper lateral incisors erupt;

At 9-12 years old, the first and second deciduous molars fall out, and the first and second bicuspids erupt;

At the age of 10-12, the deciduous canines fall out and the permanent canines erupt.

3. Reasons why children’s deciduous teeth do not fall out

1. When new and old teeth coexist during tooth replacement, the deciduous teeth should be extracted. The fallen deciduous teeth have no roots and the fallen surface appears eroded. After the deciduous teeth are extracted, the permanent teeth will slowly move to the original position of the deciduous teeth due to the push of the tongue. At this time, if there is enough space, the permanent teeth can grow straight. If the juxtaposition of deciduous teeth and permanent teeth is ignored, it may cause uneven teeth arrangement or malocclusion, and it is also easy to cause tooth decay due to incomplete teeth cleaning.

2. Severe caries of deciduous molars can cause periapical infection, which can lead to adhesion and retention of the roots of deciduous teeth. At this time, the bad teeth should be repaired and treated as soon as possible.

3. The position of the permanent tooth germ is abnormal, the eruption tract is abnormal, and the permanent tooth will erupt ectopically. At this time, the root of the deciduous tooth is completely or partially not absorbed, resulting in the phenomenon of retained deciduous teeth.