Mouth Tongue Teeth and Tooth Decay


 
 
Concept Explanation
 

Mouth Tongue Teeth and Tooth Decay

Mouth: Mouth consists of oral cavity, through which food is ingested. It is bounded by lips and cheeks. It contains gums, teeth, a tongue and muscles.

  • The tongue tastes the food and moves it to pharynx. Tongue is a highly muscular sensory organ present at floor of buccal cavity. It bears several taste buds and helps in mixing food with saliva. Teeth help in biting, cutting and chewing food. Teeth masticate the food. This makes it easier to swallow food and increases its surface area for various digestive secretions to act on.
  • Teeth :  The four types of teeth are: incisors, canines, premolars and molars.

  • Incisors help in cutting the food.
  • Canines help in tearing of food.
  • Molar and premolar help in crushing, chewing and grinding of food. Our teeth are covered with a hard protective covering of ‘enamel’. The enamel covers the dentine, which is a yellowish substance forming the bulk of the tooth.
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    Sample Questions
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    Question : 1

    A new born baby has no teeth. Teeth begin to appear when the baby is six to seven months old. By the age of three year children have 20 teeth.

    Which is the layer of the teeth present below the enamel ?

    Right Option : C
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    Explanation
    Question : 2

    The process of ingestion starts from ____________________ .

    Right Option : A
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    Explanation
    Question : 3

    Which of the following are correct ?

    (a) The process of ingestion starts from mouth or oral  cavity.

    (b) In human beings, teeth grow twice. The sets of teeth that grow during infancy are called milk teeth. These are also called temporary teeth.

    (c) Tongue is free from front and can help in mixing saliva with food, swallowing the food, taking or speaking and tasting with the help of taste buds for sweet, salt, sour and bitter food.

    Right Option : B
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    Explanation
     
     
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