Question

The bulk of the tooth in mammals is made up of
A. Dentine
B. Enamel
C. Pulp cavity
D. Root.

Answer 1

Hint: Teeth are the hardest part of mammals used for chewing, tearing and grinding the food. It also plays an important role in speech. The outer white part is called enamel which is the hardest part of the teeth. It is made up of calcium phosphate and some kind of proteins.

Complete answer: Humans are mammals that possess two sets of teeth called the primary or temporary teeth and the permanent teeth. In a child, the temporary teeth appear first that are 20 in number, while in the case of adult humans, they have 32 sets of teeth which are permanent. Once the permanent teeth get damaged, they are not reformed.
A. Dentine:- It is the underlying layer in the enamel which is a hard tissue that holds the microscopic tube. When the enamel is damaged, the heat or cold enters the tooth through the damaged part and can cause sensitivity.
B. Enamel:- It is the hardest tissue or substance in the human body. It is an outer white part of the tooth mostly made UP of calcium phosphate, i.e. a rock-hard mineral.
C. Pulp Cavity:- It is the pulp or pulp chamber which is a soft area of the tooth that contains the nerve, blood vessels and connective tissues. The root canal travels from the root tip of a tooth into the pulp chamber.
D. Root:- The root of the tooth is present below the gum line in both upper and lower jawbones. Holding the tooth in the mouth, a different type of tooth has a different number of root and root formation.
Hence, the correct answer is option A.

Note: In humans, the number of teeth includes eight incisors, four canines, eight premolars and eight molars in one set of the adult human jaw, while in the case of a child, it has eight incisors, four canines, and eight first molars. Teeth of a child are also called milk teeth or temporary teeth.