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A baby boy aged two years is admitted to...

A baby boy aged two years is admitted to play school and passes through a dental check-up. The dentist observed that the boy had twenty teeth. Which teeth were absent?

A

Incisors

B

Canines

C

Premolars

D

Molars

Text Solution

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The correct Answer is:
To solve the question about the baby boy who has 20 teeth and to determine which teeth are absent, we can follow these steps: ### Step 1: Understand the types of teeth The human dentition consists of two main types of teeth: primary (milk) teeth and permanent teeth. Children typically have 20 primary teeth, while adults have 32 permanent teeth. ### Step 2: Identify the composition of primary teeth Primary teeth include: - Incisors: 8 (2 on the top and 2 on the bottom, for a total of 4) - Canines: 4 (1 on the top and 1 on the bottom, for a total of 2) - Molars: 8 (2 on the top and 2 on the bottom, for a total of 4) This gives us a total of 20 primary teeth. ### Step 3: Determine which teeth are typically absent in a 2-year-old At the age of 2, children usually have most of their primary teeth, but they do not have any permanent teeth yet. The primary teeth present at this age would typically include: - 4 incisors - 2 canines - 4 molars ### Step 4: Identify the absent teeth Since the question states that the boy has 20 teeth, we can conclude that he has all of his primary teeth. However, he does not have any premolars because premolars do not appear until later in childhood. ### Conclusion The absent teeth in the baby boy's mouth are the **premolars**. ---
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