Structure and growth of Teeth
Teeth
Teeth are very important part of our body. They help us to eat food and speak clearly. There are many words which we cannot speak without teeth. You may feel difficulty to understand many words spoken by an old man without teeth. Teeth also give shape to our face also. A baby is born without teeth. Teeth begins to grow only after a baby is few months old. By the time a child is 2-3 years old,it has 20 teeth. These are also known as milk teeth or temporary teeth. At the age of six, the milk teeth starts falling off. New teeth grow in their place. The new set of teeth is called permanent teeth. All the permanent teeth grow by the age of 12 to 13. Generally, there are 28 permanent teeth. Four more teeth is called wisdom teeth come out between the age of 20 to 25 therefore, every adult has a set of 32 permanent teeth, 16 in the upper jaw and 16 in the lower jaw.
Structure of teeth
This is also quite hard like a bone. The soft material inside the dentine is called pulp. This is soft and has blood vessels and nerves in it. Our tooth get nourishment through the pulp.
Kinds Of Teeth
1. Incisors (cutting teeth) : These are four front teeth in each jaw. These have sharp and straight edges. They are shaped like chisels and are used for cutting and biting the food. For this reason, these are called cutting teeth.
2. Canines (tearing teeth) : canines are sharp and pointed teeth present on both sides of the incisors if each jaw. These are used for tearing the food. There are two canines in each jaw.
3. Premolars (cracking teeth): These are broad teeth next to the canines acts like a but cracker. There are 4 premolars in each jaw. Two of them on either side of canines.
4. Molars (grinding teeth): There are six molars in each jaw. They are broader than premolars and have broad surface to grind the food.
Teeth are very important part of our body. They help us to eat food and speak clearly. There are many words which we cannot speak without teeth. You may feel difficulty to understand many words spoken by an old man without teeth. Teeth also give shape to our face also. A baby is born without teeth. Teeth begins to grow only after a baby is few months old. By the time a child is 2-3 years old,it has 20 teeth. These are also known as milk teeth or temporary teeth. At the age of six, the milk teeth starts falling off. New teeth grow in their place. The new set of teeth is called permanent teeth. All the permanent teeth grow by the age of 12 to 13. Generally, there are 28 permanent teeth. Four more teeth is called wisdom teeth come out between the age of 20 to 25 therefore, every adult has a set of 32 permanent teeth, 16 in the upper jaw and 16 in the lower jaw.
Structure of teeth
Structure of tooth
A tooth is fixed to the gum by its root. The portion of tooth seen above the gum is called the crown. The portion just below the crown and above the root is known as neck. The outer cover of the tooth is very hard. This is called enamel. Below the enamel lies the dentine.
Kinds Of Teeth
1. Incisors (cutting teeth) : These are four front teeth in each jaw. These have sharp and straight edges. They are shaped like chisels and are used for cutting and biting the food. For this reason, these are called cutting teeth.
2. Canines (tearing teeth) : canines are sharp and pointed teeth present on both sides of the incisors if each jaw. These are used for tearing the food. There are two canines in each jaw.
3. Premolars (cracking teeth): These are broad teeth next to the canines acts like a but cracker. There are 4 premolars in each jaw. Two of them on either side of canines.
4. Molars (grinding teeth): There are six molars in each jaw. They are broader than premolars and have broad surface to grind the food.
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