Are teeth hardwhat are teeth made up off

Expert Answers
hannahshychuk eNotes educator| Certified Educator

Yes, teeth have to be hard in order to withstand the chewing, crunching, and tearing of food. The hard material of the tooth is made up of minerals, like calcium and phosphorus. Most of a tooth is made up of dentine, and the hard, outer layer is enamel. Even the root of a tooth is covered with a hard material called cementum. At the center of a tooth (surrounded by all of the hard material already mentioned) is what is called the dental pulp, which contains nerves, arteries, and veins.

besure77 eNotes educator| Certified Educator

Yes, teeth are hard. They have to be in order to withstand a lifetime of use. Humans are omnivores which means that we eat both meat and vegetables. The hard part of teeth are made up of calcium, phosphorus, and many other minerals. Our teeth are covered in a protective enamel.

lrwilliams eNotes educator| Certified Educator

The outer protective layer of enamel is said to be the hardest substance in the body. This is also where tooth decay begins. The enamel has no feeling, the pain of tooth decay begins when the decay reaches the dentin. If the decay reaches the pulp it can be incredibly painful.

litteacher8 eNotes educator| Certified Educator
Teeth are hard, but they are also somewhat porous. This means that they have microscopic holes. Your teeth are also not solid. They have roots growing in the center, and the center can be seen as soft. This is where you get cavities.
krishna-agrawala | Student

Teeth are the hardest parts of the human body. The teeth are made up of four different parts made up of different kinds of tissues. These parts of the teeth are:

  1. Pulp: This is the innermost part of the tooth, and is quite soft.
  2. Dentine: This is a hard yellow substance surrounding the pulp. It makes up most of the tooth and is made up of substance harder than bones.
  3. Enamel: This consists of the outermost covering on the crown of the dentine. It is made up of tissues that constitute the hardest part of the human body.
  4. Cementum: this forms the covering on the tooth in parts below crown, which are not covered by enamel. This part of tooth is about as hard as bones.
giorgiana1976 | Student
Tooth (Latin dens, dentis, Greek: odous) is a bone organ , hard, white, generally composed from a free crown and one or  more  roots implanted in the mouth, specifically in the alveolar bone of the jaw bones (maxillary and mandible), and it is used ,particularly, for the cutting, the crushing and grinding of food.  Tooth crown is covered by enamel. Enamel is thicker towards the root, and has in its composition mineral substances, water and organic substances. The root has at the surface cement, an organo-mineral substance, proliferated throughout tooth existence and it's arranged in the form of collagen fibers. Both,in the root and the crown is another substance, called dentine, formed during embryo period. Pulp is found deep in the tooth ,being filled with soft connector tissue.In the pulp, there are nerves and blood vessels that enter in the tooth through the apical root canal. The pulp is often called "the tooth nerve".