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Consider the following pairs: (i) Incisors -     biting and tearing (ii) Canine -     grinding (iii) Premolars -     chewing (iv) Molar -     tearing which of the above pairs are incorrectly matched?

Consider the following pairs: (i) Incisors -     biting and tearing (ii) Canine -     grinding (iii) Premolars -     chewing (iv) Molar -     tearing which of the above pairs are incorrectly matched? Correct Answer (ii) and (iv)

 

EXPLANATION:

  • In an adult human 32 teeth are found.
  • The arrangement of different types of teeth in humans from front to back is incisor- canine-premolar-molar.

Types Functions Number in each jaw
Incisors Cutting and biting 4
Canine Ripping and tearing 2
Premolars Chewing and grinding 4
Molars Chewing and grinding 6

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  • The first set of teeth grows during infancy and they fall off at the age between six to eight years. These are termed milk teeth.
  • The second set that replaces them is the permanent teeth. The permanent teeth may last throughout life or fall off during old age or due to some dental disease.
  • Incisors, the eight teeth in the front of the mouth (four on top and four on bottom) are the teeth that you use to take bites of your food.
    • Incisors are usually the first teeth to erupt at around 6 months of a baby and between ages 6 and 8 for an adult set.
  • Canines, the four canines (fangs) are the sharpest teeth and are used for ripping and tearing food apart.
    • Primary canines generally appear between 16 and 20 months, with the upper canines coming in just ahead of the lower canines.
    • In permanent teeth, the order is reversed, with lower canines erupting around age 9 and the uppers arriving between ages 11 and 12.
  • Premolars are used for chewing, cracking, and grinding food.
    • Adults have four premolars on each side of their mouths.
    • Two on the upper and two on the lower jaw.
    • There are no primary premolars; the first premolars appears around age 10, with the second premolars arriving about a year later.
    • These take the places of the first and second primary molars.
  • Molars are also used for chewing and grinding food. Primary molars, also known as deciduous molars, appear between 12 and 28 months.

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