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ScienceGrade 2

Why Do Our Teeth Fall Out?

Children have a set of baby teeth, also called primary teeth

Learning Objective

Students will learn why baby teeth fall out and how adult teeth grow in.

What You'll Learn

  • Baby teeth help kids chew and make space for adult teeth
  • As children grow, their jaws get bigger
  • Adult teeth form under the gums and push baby teeth out
  • Losing teeth is a normal part of growing up

Words to Know

Baby teeth
The first set of teeth
"I lost one of my baby teeth."
Adult teeth
The second set of permanent teeth
"My adult tooth grew in."
Jaw
The bone that holds your teeth
"My jaw grew bigger."
Wiggly
Loose and moving
"My tooth was wiggly."

Check What You Learned

Quick Quiz

1 / 5

Which of these is TRUE?

Fun Facts

  • Children have 20 primary (baby) teeth that begin to erupt around 6 months of age

    Source: American Dental Association

  • Adult teeth, also called permanent teeth, develop under the gums before birth and erupt during childhood

    Source: ADA

  • As the jaw grows, permanent teeth resorb the roots of primary teeth, causing them to loosen and fall out

    Source: ADA

  • Primary teeth hold space and guide permanent teeth into proper position

    Source: American Academy of Pediatric Dentistry

  • Most children lose their first primary tooth around age 5-6

    Source: AAPD

  • Permanent teeth are meant to last a lifetime; good oral hygiene is essential

    Source: ADA

Watch next

Why Do We Get Nosebleeds?

The inside of the nose has many tiny blood vessels close to the surface

Lesson Info

Grade 2
2026-07-29

Standards Alignment

  • 4-LS1-1

    Internal structures support survival, growth, and reproduction

Play the whole series

Episode 22 of gross body files

Keywords

2nd grade sciencescience for kidsourteethfalloutbaby teethadult teethjawwiggly4-LS1-1kids learning
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