First, the shape of the teeth
The shape of teeth can be divided into crown, neck and root.
1. Crown: The crown is the part exposed to the mouth, which is conical, white and shiny.
2. Neck: The neck is a slightly slender part connecting the crown and the root of the tooth, which is wrapped by the gum.
3. Root: The root is embedded in the alveolar bone and closely connected with the alveolar bone.
Second, the structure of teeth.
The structure of teeth is mainly composed of dentin, enamel, cementum and pulp.
1. Dentin: Dentin is the main part of teeth, dense and hard.
2. Enamel: Enamel is a layer of white, bright and hard tissue covering the surface of the crown, which is the tissue with the highest degree of calcification in the human body.
3. Cementum: Cementum is located at the root of the tooth and is the outer coating of dentin.
4. Dental pulp: The dental pulp is located in the tooth cavity and is filled with blood vessels, nerves and connective tissue.
Third, the structure of teeth.
1. Crown: Crown is the outermost layer of teeth, which is composed of enamel and cementum, and is responsible for chewing food and protecting pulp.
2. Neck: The structure of the neck is similar to that of the crown, but thinner, which is responsible for connecting the crown and the root and protecting the pulp.
3. Root: The root is located in the alveolar cavity and consists of cementum, which is closely connected with the alveolar bone and is responsible for fixing and supporting the teeth.
Fourth, the function of teeth.
1. Chewing function: Teeth are the most powerful chewing organs in the human body, which are responsible for chewing food and helping digestion.
2. Pronunciation function: teeth play an auxiliary role in pronunciation, and different tooth structures have an influence on pronunciation.
3. Facial beauty: Teeth also play an important role in facial beauty, and neat and white teeth can enhance facial image.
4. Maintain oral ecological balance: teeth and periodontal tissues are isomorphic to form an oral ecological system to maintain the balance of microorganisms in the oral cavity.
In a word, the shape and structure of teeth not only ensure their strong performance in chewing and pronunciation, but also have important significance for facial beauty and oral health. Therefore, we should pay attention to dental care, prevent oral diseases and maintain oral health.