Question

In human teeth, which of the following helps in cutting?
A. Molar teeth
B. Incisor
C. Molar
D. Premolar

Answer 1

Teeth help a person to use their mouth to eat, chew, speak, smile and it also gives shapes to face. We have teeth present on both the jaws. Each type of tooth has a name and different functions. Canines are sharp in carnivorous and will develop molars and premolars are present in herbivores.

Complete answer:
In humans, teeth are thecodont, heterodont and diphyodont including milk teeth or deciduous teeth and permanent teeth. There are 32 permanent teeth, 16 in the upper and 16 in the lower jaw. A child has temporary teeth called milk teeth are 20 in number that are replaced by a new set of bigger teeth called permanent teeth. Different teeth are of different shapes. They perform different functions. The four types of teeth are:- incisors, canines, premolars and molars. They vary in shape, size and number.

Types of Teeth:
Incisors or Cutting Teeth: They are used for cutting and slicing the food. Incisors are four front teeth in each jaw, so there are 8 incisors.
Canines or Tearing Teeth: Canines are sharp and pointed. They are used for tearing the food. A canine tooth is present on each side of the incisors. There are 4 canines in total, two in the upper and two in the lower jaw.
Premolars or Cracking Teeth: These are broad teeth, present next to the canines. There are a total of 8 premolars, four in each jaw. They help to crack the food and chew it properly.
Molars or Grinding Teeth: They are bigger, flatter and broader than the premolars. These help to grind and crush the food. There are a total of 6 molars, present next to premolars, in each jaw.
The structure of teeth has three main parts - Crown, neck and root. It is made up of three layers of Enamel, dentine and pulp.

Hence, the correct answer is option (B).

Note: The four front teeth in each the upper and lower jaws area are referred to as incisors. Their primary function is to cut food into small pieces. The 2 incisors on either side of the midline are referred to as central incisors. The 2 adjacent teeth to the central incisors are referred to as the lateral incisors. Incisors are shovel – shaped and have one root and a pointed incisal edge.