Teeth

Teeth are hard, calcified structures found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores, also use teeth for hunting or for defensive purposes. The roots of teeth are covered by gums. Teeth are not made of bone, but rather of multiple tissues of varying density and hardness that originate from the embryonic germ layer, the ectoderm.

Structure

Teeth are composed of multiple tissues of varying density and hardness. The cellular tissues that ultimately become teeth originate from the embryonic germ layer, the ectoderm.

Crown

The crown of a tooth is that part of the tooth that is covered with enamel and this is normally the only part visible in the mouth. The crown is usually the most visible part in the mouth, covering the tooth and protecting it from harsh oral conditions.

Root

The root is the part of the tooth that extends into the bone and holds the tooth in place. It makes up approximately two-thirds of the tooth and holds the tooth in place.

Function

Teeth are used for breaking down food by mastication. The precise shape and arrangement of teeth is also important for pronunciation and speech.

Development

Tooth development is the complex process by which teeth form from embryonic cells, grow, and erupt into the mouth.

Human teeth

Humans have four types of teeth: incisors, canines, premolars, and molars, each with a specific function. The incisors cut the food, the canines tear the food and the molars and premolars crush the food.

Dental health

Maintaining good dental health is important to avoid pain and tooth loss. Regular check-ups by a dentist are recommended.

See also

• Dentistry
• Oral hygiene
• Tooth decay
• Tooth enamel
• Tooth extraction

Teeth Resources
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