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Lesson 3 Caring for Your Teeth
Bellringer
Write a brief paragraph that describes a trip you took to
the dentist.
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Lesson 3 Caring for Your Teeth
Objectives
• Describe the structure and function of teeth.
• Identify two minor problems of teeth.
• Describe how a cavity forms.
• Describe effective dental care.
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Lesson 3 Caring for Your Teeth
Start Off Write
How does a cavity form?
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Lesson 3 Caring for Your Teeth
Structure and Function of Teeth
• The shiny, white portion of the tooth is called the
crown.
• The crown is white and hard because it is covered
by enamel, the hardest substance in your body.
• The next slide shows the parts of your teeth.
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Lesson 3 Caring for Your Teeth
Tooth and Gum Problems
• Healthy Gums Check your gums regularly by
looking at them in the mirror. Your gums should be
bright pink and free from sores.
• What Is Plaque? Plaque is a mixture of bacteria,
saliva, and food particles. It is very sticky and binds
to the enamel of your teeth. The bacteria and acid
found in plaque can cause bad breath and even
worse—cavities!
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Lesson 3 Caring for Your Teeth
Dental Cavities
• What Is a Cavity? A cavity is a hole in your tooth
that is made by acids.
• How Are Cavities Formed? A cavity begins when
plaque forms on your tooth. The plaque holds the
acids very close to the enamel of the tooth. Even
though the enamel is very tough, the acids
eventually eat through it and make a hole.
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As dentin decays, the cavity eventually reaches the
pulp.
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Lesson 3 Caring for Your Teeth
How to Brush Your Teeth
1. Brush at least twice a day.
2. When you brush, move the toothbrush up and
down and back and forth.
3. Be sure to brush between your teeth.
4. Also, be sure to brush your gums.
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Lesson 3 Caring for Your Teeth
How to Floss Your Teeth
1. Use 12 to 18 inches of floss.
2. Wrap a few inches of floss around one finger of
each hand.
3. Slip the floss between two teeth, and move it up
and down and back and forth on each inner surface
of each tooth.
4. Go slightly below gum level to reach the trapped
plaque.
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Lesson 3 Caring for Your Teeth
Keeping Your Teeth for Life!
1. Use a toothpaste that contains fluoride.
2. Use a toothbrush with soft bristles.
3. Replace your toothbrush every few months.
4. Eat foods high in calcium.
5. Limit the amount of sugary foods you eat.
6. Visit your dentist regularly.
Chapter 7
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Lesson 4 Caring for Your Eyes
Bellringer
Explain why you blink your eyes.
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Lesson 4 Caring for Your Eyes
Objectives
• Identify the parts of the eye.
• Explain how the eye works.
• Describe five ways to take care of your eyes.
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Lesson 4 Caring for Your Eyes
Start Off Write
Why should you wear eye protection when you work
with hand tools?
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Lesson 4 Caring for Your Eyes
How Eyes Work
• The Parts of Your Eye Your eyelids protect your
eyes and bathe them in tears to remove dust and
harmful bacteria. The rest of parts of your eye are
illustrated on the next slide.
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Lesson 4 Caring for Your Eyes
Eye Care
• Wear a protective face mask or goggles
whenever your eyes could be hit or hurt.
• Wear sunglasses to prevent eye damage from
the sun.
• Don’t rub your eyes.
• Get regular eye exams.
• Never wear glasses that are prescribed for
someone else.
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These eye problems cannot be prevented.
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Quote of the Day
“You don’t have to brush your teeth – just
the ones you want to keep.”
—Author Unknown