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 food and the molars and premolars crush the food. The roots of teeth are embedded in the maxilla (upper jaw) or the mandible (lower jaw) and are covered by gums.

2025年2月14日 · 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 and masticating food, for defense, and for other specialized purposes. The teeth of vertebrates represent the modified descendants of bony dermal (skin) plates that armoured ancestral fishes.

区别：1、代表个数不一样：tooth表示一个，teeth就是表示两个或者两个以上。 2、形式不一样：tooth是单数，teeth是tooth是复数。 3、tooth和teeth读音不一样：tooth 意思是：牙齿 ，读音：英 [tu&

What’s the anatomy of a tooth? A tooth consists of two main structures: Crown. This is the part of your tooth that you can see — the portion above your gums. Enamel — a hard, protective substance — covers your tooth crown. Root. This is the part of your tooth that holds it in your jaw. You can’t see the root because your gums cover it.

A tooth (pl.: teeth) is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores and omnivores , also use teeth to help with capturing or wounding prey, tearing food, for defensive purposes, to intimidate other animals often including their own, or to carry ...

2018年5月15日 · We’ll go over the anatomy of a tooth and the function of each part. We’ll also go over some common conditions that can affect your teeth, and we’ll list common symptoms to watch for.

2023年10月30日 · The tooth is one of the most individual and complex anatomical as well as histological structures in the body. The tissue composition of a tooth is only found within the oral cavity and is limited to the dental structures. Each tooth is paired within the same jaw, while the opposing jaw has teeth that are classified within the same category.

TOOTH翻译：嘴巴, 牙，牙齿, 尖端, （工具边缘、梳子、锯、拉链等的）齿状物，齿, 力量。 了解更多。

2024年4月11日 · Overview of Tooth Anatomy. Teeth are important for breaking down food before we swallow it. In the tooth anatomy, we can find four types of teeth, each with a different job. Incisors cut food, canines tear it, and molars and premolars crush it. Most people have 32 teeth, but that can vary.

This article provides a brief review of recent investigations concerning the structure and properties of the tooth. The last decade has brought a greater emphasis on the durability of the tooth, an improved understanding of the fatigue and fracture behavior of …