Tooth Swap Teacher Guide Grades 1–2 Science & Health Human Body & Growth
Tooth Swap Science: Teacher Guide
Why Baby Teeth Loosen and Adult Teeth Grow In Beneath the Gums
45–55 Minutes
Big Question Where do wobbly teeth go, and what pushes them out?
Key Mechanism Root resorption (roots gently dissolve from below)
Tooth Counts 20 Primary (Baby) vs. 32 Permanent (Adult)
Standards NGSS 1-LS1-1, 1-LS3-1 & NHES 1 (Health)
Learning Objectives (SWBAT)
Identify that permanent adult teeth grow directly beneath baby teeth in the jawbone.Explain that growing adult teeth cause baby tooth roots to safely melt away (resorption), making baby teeth loose and wobbly.Differentiate between the 20 smaller baby teeth and 32 stronger adult teeth designed for a growing jaw.Demonstrate safe habits when experiencing a loose tooth (no aggressive yanking, gentle wiggling, clean hands).
Materials List
Tooth Swap Slide Deck
Tooth Detective Worksheet (1 per student)
Small handheld mirrors (optional, for mouth check)
Crayons or colored pencils
Chart paper for group tooth tally
Step-by-Step Lesson Sequence
Time Phase Teacher Moves & Student Actions 10 min Hook & The Wobbly Mystery Ask students: "Raise a quiet thumb if you have lost a tooth or have a wobbly one right now!" Show a fallen baby tooth illustration. Ask: "Where did the long root go? Did it break off, or did something magic happen inside your jaw?" Record class predictions on chart paper. 15 min Slide Tour & Diagram Study Present Tooth Swap Slides . Guide students through cross-section diagrams showing the baby tooth resting in the gum line and the adult tooth bud waiting underneath. Introduce the concept of root dissolving (resorption) like an ice pop melting gently against warm pressure. 15 min Investigation Worksheet Distribute the Tooth Swap Diagram Worksheet . Model how to sequence the 4 stages of tooth replacement: (1) Baby tooth anchored, (2) Adult tooth grows upward, (3) Root dissolves, (4) Wobbly tooth releases and adult tooth crowns. Students color and label their diagrams. 10 min Synthesis & Tooth Rules Review the 3 Golden Wobbly Tooth Rules : (1) Wiggle gently with clean tongue or clean fingers, (2) Never yank with doors or strings (protects tender gums), (3) Keep the empty gap clean. Complete quick formative check.
Tooth Swap Science • Instructional Pacing • Page 1 of 2 Grade 1–2 Science & Health Curriculum
Instructional Dialogue & Facilitation Guide
Discussion scripts, scientific analogies, misconceptions, and differentiation
Page 2
Teacher Script & Guiding Questions
Explaining Why We Get Two Sets of Teeth (The Shoe Size Metaphor):
"Could you wear your baby shoes today? No way! Your feet grew much bigger! Your head and jaws are growing bigger too. Baby teeth are like tiny shoes—they fit perfectly when you were a toddler. But as your jaw grows wider and stronger, you need bigger, stronger teeth to chew adult food for the next 70+ years!"
Explaining The Dissolving Root (The Ice Pop Analogy):
"When an adult tooth gets ready to come up, it sends a chemical signal that says: 'Time to make room!' The roots of your baby tooth begin to melt away, just like an ice pop melting on a sunny sidewalk. The body reabsorbs the minerals to make the new adult tooth super strong! That is why fallen baby teeth look hollow or short."
Addressing Primary Grade Misconceptions
Common Misconception Scientific Reality & Correction "Baby teeth never had roots because the tooth came out looking like a little flat crown." Baby teeth had long, strong roots! As the adult tooth grew upward, it melted the root away so the tooth could release painlessly. "If an adult tooth falls out, another one will grow behind it." We only get ONE set of permanent teeth. Once an adult tooth grows in, we must protect it with daily brushing and flossing forever. "Wobbly teeth should be pulled out fast by tying string to a doorknob." Yanking teeth before roots are completely dissolved tears fragile gum tissue. Teeth should only be wiggled gently until they fall out naturally.
Differentiation & Learning Accommodations
Emerging Writers
Provide cut-and-paste picture sequence cards instead of written captions. Allow verbal explanations during check-ins.
Multilingual Learners (ELL)
Use color-coded diagram arrows (Blue = baby tooth, Green = adult tooth, Pink = gums). Pair with bilingual vocabulary cards.
Extension / High Flyers
Have students compare human tooth replacement (diphyodont = 2 sets) with sharks (polyphyodont = endless conveyor belts of replacement teeth!).
End-of-Lesson Formative Assessment Checks
1. Thumbs Check: "Point to where the adult tooth waits before it comes in: Above the baby tooth or below in the jawbone?" (Jawbone below)
2. Quick Share: "Why do baby teeth get loose?" Look for: Adult tooth pushes up and melts/dissolves the root!
Tooth Swap Science • Facilitation & Differentiation • Page 2 of 2 Grade 1–2 Science & Health Curriculum
Tooth Swap Slides Grades 1–2 Science & Health
Tooth Swap Science!
Why Baby Teeth Fall Out & Adult Teeth Grow In
The Great Wobbly Tooth Mystery
Discover What Is Happening Inside Your Jaw!
Observation Time
The Wobbly Tooth Mystery
Have You Lost a Tooth?
When a baby tooth falls out, it looks tiny and hollow underneath like a little white cap!
Did the root break off? Or did something amazing happen inside your gums?
The Secret Below
Your baby tooth did have long roots to keep it tight while you were little!
A new adult tooth growing directly underneath made the roots safely melt away!
Let's peek inside the gums to see how it works!
Anatomy Diagram
Inside Your Jawbone
Cross-Section View
1. Baby Tooth 2. Pink Gums 3. Root Melting! 4. Adult Tooth 5. Jawbone
Crown (Top)
The shiny white part you see in the mirror that chews food.
Root (Bottom)
Anchors the tooth into bone like tree roots in the dirt.
Adult Tooth Bud
Waits patiently deep in the jawbone until your body is ready!
Key Discovery: Adult teeth grow from bottom to top!
The Process
How the Swap Happens
4 Simple Steps
1
Strong & Tight
Baby tooth has long roots holding it tight in the jaw.
Toddler Years
2
Pushed from Below
The new adult tooth begins growing upward toward the root.
Age 5 to 7
3
Root Melts Away!
The root slowly dissolves. The tooth begins to wiggle!
Wobbly Time!
4
Adult Tooth Pops In
Baby tooth drops out. Strong permanent tooth takes its place!
Lifelong Tooth
Big Science Word: Resorption = When your body safely dissolves the root!
Jaw Growth
Small Jaws to Big Jaws
By the Numbers
20
Baby (Primary) Teeth
Fits inside a small toddler jaw
Helps little kids learn to talk & chew
Hold spaces open for adult teeth
32
Adult (Permanent) Teeth
Larger, stronger, thicker enamel
Fits the larger jaw of an adult
Tooth Swap Diagram Worksheet Tooth Detective Lab
The Great Tooth Swap Diagram
Grades 1–2 Science
Name:
Date:
Part 1: Inside the Gums! Label the Tooth Parts
Use the Word Bank
A. Crown (Chewing Top) B. Pink Gums C. Melting Root D. New Adult Tooth
1. Pointing to the top white chewing part:
2. Pointing to the soft pink tissue:
3. Pointing to the melting, dissolving bottom:
4. Pointing to the new tooth waiting below:
Part 2: Story of a Wobbly Tooth (Number in Order 1, 2, 3, 4)
Write the numbers 1, 2, 3, and 4 in the circles to show what happens first, next, and last.
The Root Melts Away
The growing adult tooth touches the baby tooth roots, making them dissolve until the tooth wiggles.
Tight Baby Tooth
The baby tooth sits firmly in the jaw with long strong roots to help toddlers chew food.
Adult Tooth Takes Over!
The baby tooth drops out naturally. The big, strong adult tooth pokes through into the smile gap!
Adult Tooth Grows Upward
Deep in the jawbone, a permanent adult tooth bud wakes up and starts growing up toward the surface.
Tooth Swap Science • Student Investigation Worksheet • Page 1 of 2 Turn over for Part 3 & Care Challenge! →
Tooth Swap Science: Part 3 & Reflection
Tooth Counts, True or Myth, and Your Growing Smile
Page 2
Activity A: Compare the Two Sets of Teeth
Baby (Primary) Teeth Small Jaw
Count how many baby teeth little kids have in total:
Total Baby Teeth:
Adult (Permanent) Teeth Grown Jaw
Adult teeth are bigger, stronger, and stay for life:
Total Adult Teeth:
Activity B: True or Tooth Myth? (Fill in the Circle)
1. Baby teeth had long roots before the adult tooth dissolved them.
True Myth
2. You should yank loose teeth fast using a doorknob and string.
True Myth
3. Permanent adult teeth wait deep in the jawbone until you are ready.
True Myth
Activity C: My Growing Smile Reflection
Draw your smile (or a wobbly tooth gap!):
Complete the scientific sentence:
My baby teeth fall out so that...
Tooth Swap Science • Student Investigation Worksheet • Page 2 of 2 Great job, Tooth Detective! • Grade 1–2 Science & Health
Tooth Swap Worksheet Key Teacher Answer Key Tooth Swap Science
Worksheet Solutions & Scoring Guide
Quick Reference
Part 1: Diagram Labeling Answers
1. Top white chewing part: Crown (Chewing Top)
2. Soft pink tissue: Pink Gums
3. Melting, dissolving bottom: Melting Root (Resorption)
4. New tooth waiting below: New Adult Tooth
Part 2: 4-Step Sequence Order
1
Tight Baby Tooth (Firm roots in toddler jaw)
2
Adult Tooth Grows Upward (Starts in jawbone below)
3
The Root Melts Away (Root resorbs, tooth wiggles)
4
Adult Tooth Takes Over! (Baby drops, adult emerges)
Activity A & B: Tooth Counts & Myth Busting Solutions
Tooth Count Answers:
Total Baby (Primary) Teeth: 20 Teeth
Total Adult (Permanent) Teeth: 32 Teeth
True / Myth Explanations:
1. Roots before dissolving: TRUE
2. Yank loose teeth with doorknobs: MYTH (Causes gum injury)
3. Adult teeth wait in jawbone: TRUE
Activity C: Sentence Starter Rubric & Exemplar Responses
Prompt: "My baby teeth fall out so that..."
Meets Expectations (Grade 1)
"...bigger adult teeth have room to grow in."
Meets Expectations (Grade 2)
"...stronger permanent teeth can chew food as my jaw grows bigger."
Advanced / Scientific
"...the adult tooth below can push through after the baby root melts."
Tooth Swap Science • Answer Key & Rubric • Teacher Reference For classroom instructional use
