Human teeth are made up of phosphorous, calcium and other minerals. Human teeth as compared to animals are quite small in size. Teeth are very important because without them no one can chew, crush or grind food. Even we cannot speak if we don’t have teeth as they help in articulating sounds and words. With the help of teeth, we can easily break down the food into small particles which are easily digested in our stomach. During the prenatal stage, the babies experience the development of the teeth. Initially, the teeth are not visible, but as soon as the infant turns 5 to 6 month old, the teeth start becoming visible. And by the age of 2 to 3, most kids grow 20 teeth which are known as milky/deciduous teeth. Since the milky teeth are not permanent, they begin to fall at the age of six.[irp]
Replacing the baby milky teeth, the adult teeth start growing and they are for the life time. A baby has 20 milky teeth where as an adult human being has a total of 32 teeth. As a person grows more 12 additional teeth appear without disturbing the position and location of the 20 baby teeth that already exists. Every adult should have total 32 teeth comprising of 8 incisors, 4 canines, 8 premolars and 12 molars. The molar teeth consist of 4 wisdom teeth which develop and become visible at the age of 18.
TYPES OF ADULT TEETH AND THEIR FUNCTIONS:
INCISORS: Located in the central position in front of the mouth. Four incisors constitute the top line and four are present at the bottom line. They are the first baby teeth to appear when the infant is six-month old Incisors help to bite the food easily
CANINES: Very sharp teeth with pointed edges. They have the longest root and the strongest tooth. These teeth start to grow when the child is 20 months old. These are four in number and developed after the incisors. The lower canines grow and erupt earlier than the upper canines. Their function is to tear the food, especially meat.
PREMOLARS: Every adult has eight premolars with four present at the right side and four present on the left side of the mouth. Between the ages of 10 to 11 years, pre-molars begin to erupt. “Bicuspids” is the other name for Premolars. They are used to grind the food into particles[irp]
MOLARS: Every adult has total 8 molars, four constituting the upper jaw and four are presents in the lower jaw. They help us to chew the food properly. The third molars appear in the last and they are known as Wisdom teeth. They start to appear at the age of 18. Most people never grow third molars and many get rid of them as they may cause pain.