These teeth with similar names to deciduous teeth are also similar to the original distribution position, symmetrically and evenly distributed on both sides of the maxilla. Compared with deciduous teeth, permanent teeth have eight bicuspids and four molars.
Everyone has these eight bicuspid teeth, but the number of these four molars is different, which is why some people have only 28 teeth, while others have 32 teeth.
Extended data:
Tissue structure of teeth:
Enamel: the surface layer of the crown, translucent, milky calcified tissue, containing 96% inorganic matter, 4% water and organic matter.
Dentin: It is the main part of teeth, light yellow and shiny, containing 70% inorganic matter and 30% organic matter. There are nerve endings in dentin, which are pain receptors.
Cementum: a layer of calcified connective tissue on the surface of root, yellowish in color, containing 55% inorganic substances, similar in composition and hardness to bone but without Haval canal. Cementum has a new function.
Dental pulp: the loose connective tissue in the pulp cavity, which contains blood vessels, lymphatic vessels, nerves, fibroblasts and odontoblasts, has the ability to form secondary dentin. The pulp nerve has no myelin sheath and no localization ability. Blood vessels enter and exit from the narrow apical foramen, which is easy to cause circulatory disorder and pulp necrosis.
References:
Baidu encyclopedia-tooth