Page 267 - New Medley 4 Semester 1

the age of six to nine months. By the age of two and Upper jaw Upper jaw

a half years, a baby has twenty teeth in the mouth.
These teeth are called milk teeth or temporary teeth.

The milk teeth fall out one by one, from six to twelve

years of age and gradually new teeth grow in their
place. The new set of teeth has 32 teeth, 16 teeth each
in the upper jaw and the lower jaw. These teeth are Lower jaw Lower jaw

called permanent teeth. Milk teeth Permanent teeth
Two sets of teeth in humans
Types of teeth Incisors

The set of permanent teeth has four types of teeth. Canine
These are Incisors, Canines, Premolars and Molars. Premolars

Incisors or cutting teeth: These are the sharpest Molars Upper jaw

teeth having chisel-like shape. They are used to cut
and bite the food. There are four incisors located

at the front of each jaw. Molars

Canines or tearing teeth: These are sharp, pointed Premolars Lower jaw
teeth which are present one on each side of the Canine

incisors. They are used for tearing the food. Each Incisors
jaw has two canines. Location of different teeth in the jaws

Premolars or cracking teeth: These are present next

to the canines. They are broad having flat surface.
They are used for crushing the food. Each jaw has

four premolars. Incisor Canine Premolar Molar
Different types of teeth
Molars or grinding teeth: These are present

next to premolars. They are broader than Knowledge Zone

premolars and have broad upper surfaces 1. Premolars are also called cheek teeth.
to grind the food. Each jaw has six molars. 2. Teeth are not bones. They are made of
hard and strong tissues.
Parts of a tooth

Every tooth has three main parts. These are crown, neck and root.

Crown: It is the part of a tooth that is visible to us. It remains above the gum line.

Root: It is the part of a tooth below the gum line. The root fixes the tooth in
the jaw.

265