Question

define incisor, canine, premolars and molars

Answer 1

#Incisors- they are also known as cutting teeths.
they used for cutting and biting of food.
#Canines- they are also known as tearing teeths. these sharp and cone shaped teeth used for tearing of the food.
#Premolars- (cracking teeths) the broad teeths next to canines used for cracking hard foods are called premolars. they act like nut crackers.
#molars- (grinding teeths) the broad and flat teeth used to chew and grind the food are called molars , they act like grinders.

Answer 2

Types of Teeth : 

◆ Incisors : 

Sharp, chisel- shaped Teeth, used for biting and cutting. Each has one root, and there are four in each jaw, set at the front of the mouth.

◆ Canines or Cuspids :

Cone-shaped Teeth ( often called eye or dog Teeth ) ,used to tear food, Each has a sharp point (cusp) and one root. There are two in each jaw, one each side of the incisors . In many mammals , they are long and curved .

◆ premolars or Bicuspids :

blunt, broad Teeth, used for crushing and grinding ( found in the permanent set of Teeth only ) There are four in each jaw, two behind each canine. Each has two sharp ridges (cusps) and one root, except the upper first premolars, which have two.

◆ Molars :

Blunt, broad Teeth, similar to premolars but with a larger surface area. They are also used for crushing and grinding, and each has four surface points (cusps). lower Molars have two roots each, and upper ones have three. There are six Molars in each jaw, three behind each pair of premolars, and the third ones ( at the back ) are known as Wisdom teeth.

◆ Wisdom Teeth : 

Four Molars ( the third ones in line ), lying at the end points of the jaws, they appear last of all,when a person is fully mature ( hence their name ). Often there is no room for them to come through and they get stuck in the jawbone, or impacted. A few people never develop Wisdom Teeth.