Your teeth are part of your digestive system. They break down foods by crushing or cutting them before you swallow. Most humans have 32 teeth, although some have more and some have fewer. Enamel (the protective outer layer of your teeth) is the hardest substance in the human body.
2023年1月26日
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Humans have four types of teeth: incisors, canines, premolars, and molars, which each have a specific function. The incisors cut the food, the canines tear the ...
期間: 3:39
投稿: 2019/08/21
投稿: 2019/08/21
A tooth ( pl. : teeth) is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food.
2019/10/23 · Teeth names include incisors, canines, premolars, and molars. Each type of tooth has a specific function, including biting, chewing, ...
2023/05/08 · With proper care, your teeth and gums can stay healthy throughout your life. The experts at WebMD tell you how to maintain good oral health.
tooth, any of the hard, resistant structures occurring on the jaws and in or around the mouth and pharynx areas of vertebrates. Teeth are used for catching ...
2022/06/06 · Teeth play an important role in eating, chewing and nutrition. They are different shapes and sizes to bite, tear, crush or grind food before it ...
Your teeth are composed of four dental tissues. Three of them—enamel, dentin and cementum—are hard tissues. The fourth tissue—pulp, or the center of the ...