Tooth stroke order

The stroke order of teeth is horizontal, curly, vertical hook, curly, vertical, horizontal, vertical, horizontal, curly, dot, vertical folding or vertical bending and vertical.

Tooth is a kind of structure existing in many vertebrates, and it is the hardest organ of human body. Generally speaking, it is white and hard.

It is divided into three parts: crown, root and neck, and consists of dentin, enamel, cementum and pulp. Its various shapes are suitable for various purposes, including tearing and grinding food. Some animals, especially carnivores, use teeth as fighting weapons.

There are two pairs of teeth in a person's life: primary teeth and permanent teeth.

Primary teeth: It is the first set of human teeth, with 20 teeth in total. It began to germinate about 6 months after birth and basically grew up at the age of 3.

Permanent teeth: It is the second set of human teeth, with 32 teeth in total. From the age of 6, deciduous teeth began to fall off gradually, and permanent teeth began to erupt, replacing deciduous teeth. Except the third molar, the other 28 teeth usually erupt at the age of 12. The third molar erupted late, ranging from 18 to 30 years old, and some never erupted or partially erupted (4 in total).

Permanent teeth are a person's last pair of teeth. After the permanent teeth fall off, there will be no teeth eruption in the fallen part. This paragraph introduces permanent teeth and deciduous teeth, but ignores impacted teeth. In addition to deciduous and permanent teeth, a few people have impacted teeth.

Impacted teeth are a cause of tooth deformity. It can replace permanent teeth, and it can be added in the middle or behind permanent teeth. If the permanent teeth fall off prematurely before the impacted teeth grow out, then the impacted teeth will replace the permanent teeth.