Collect data from your friends, neighbours, and classmates to know more about milk teeth".
Tabulate your data. One way of doing it is given below:
S.NoAge at which the first tooth fellAge at which the last tooth fellNo. of teeth lostNo. of teeth replaced
1.
2.
3.
4.
5.

Find out from at least twenty children and find the average age at which children lose the milk teeth. You may take help of your friends."

AcademicBiologyNCERTClass 7

The first set of teeth, called milk teeth, primary teeth, temporary teeth, deciduous teeth, or baby teeth, erupt at 6 months in the growth and development of humans and other diphyodonts, which include most mammals but not elephants, kangaroos, or manatees.

Deciduous teeth grow in embryos and erupt in infancy. In the absence of permanent replacements, they can last until maturity. Primary teeth form in embryos. The dental lamina forms in the sixth week of tooth formation. This begins in the midline and expands posteriorly.

By eight weeks, ten buds on the upper and lower arches will develop the main (deciduous) dentition. Teeth will form till they erupt. Five in each quadrant and 10 per arch make up the first dentition. Primary dentition (teething) begins at about 6 months and lasts until 25–33 months. First are the mandibular central incisors, then the maxillary second molars. There are four of each primary tooth: central incisors, lateral incisors, canines, first molars, and second molars. The major first and second molars are replaced by premolars.

Primary teeth are important for oral development. Primary teeth maintain jaw arch length, bone, and permanent teeth germs. Primary teeth guide permanent tooth eruption. Primary teeth maintain adequate spacing for permanent teeth by supporting jaw muscles and bone growth. Primary tooth roots help permanent teeth erupt. Children who have had their primary teeth removed (typically due to dental caries or dental trauma) can still eat and chew to some extent.

S.No
Age at which the first tooth fell
Age at which the last tooth fell
No.of teeth lost
No.of teeth replaced
1.
6 years11 years2030
2.
6 years12 years2028
3.
7 years12 years2028
4.
7 years13 years2032
5.
7 years13 years2028
raja
Updated on 10-Oct-2022 12:46:24

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