Teeth that appers twice in life in humana)Incisors and caninesb)premolar and molarsc)Only incisorsd)Incisors,canines,premolars and molarsCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Yes the option a is correct as human teeth are diphydont only in some cases that is regarding canines and incisors remaining are monophyodont

Answer

In milk teeth there is no premolars ,only incisiors,canines and molars are present.In permanent teeth again incisiors and canines are developed.Premolars are developed.Molars are not developed twice.

Answer

Teeth that appear twice in life in humans:

There are two sets of teeth that appear at different stages of life in humans. These teeth are known as the primary teeth (also called baby teeth or deciduous teeth) and the permanent teeth.

1. Primary Teeth:
The primary teeth are the first set of teeth that appear in the mouth during early childhood. These teeth start erupting around the age of 6 months and continue to erupt until the age of 2-3 years. The primary dentition consists of a total of 20 teeth, which are divided into four types:

- Incisors: There are a total of 8 incisors in the primary dentition, 4 in the upper jaw and 4 in the lower jaw. They are the front teeth and are used for biting and cutting food.
- Canines: There are a total of 4 canines in the primary dentition, 2 in the upper jaw and 2 in the lower jaw. Canines are sharp and pointed teeth that are used for tearing and holding food.

2. Permanent Teeth:
As the primary teeth start to shed, they are replaced by a second set of teeth known as permanent teeth. The permanent dentition consists of a total of 32 teeth, which are also divided into four types:

- Incisors: There are a total of 8 incisors in the permanent dentition, 4 in the upper jaw and 4 in the lower jaw. They are similar to the primary incisors and are used for biting and cutting food.
- Canines: There are a total of 4 canines in the permanent dentition, 2 in the upper jaw and 2 in the lower jaw. They are also similar to the primary canines and are used for tearing and holding food.
- Premolars: There are a total of 8 premolars in the permanent dentition, 4 in the upper jaw and 4 in the lower jaw. Premolars have a flat biting surface and are involved in chewing and grinding food.
- Molars: There are a total of 12 molars in the permanent dentition, 6 in the upper jaw and 6 in the lower jaw. Molars are the last teeth to erupt and are primarily responsible for grinding and chewing food.

Conclusion:
In conclusion, the teeth that appear twice in life in humans are the incisors and canines. They first appear as primary teeth during early childhood and are later replaced by permanent teeth. The premolars and molars only appear once in life, as part of the permanent dentition.

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