TEKS & Objectives
7.6. Matter and energy. The student knows that matter has physical and chemical properties and can undergo physical and chemical changes. The student is expected to distinguish between physical and chemical changes in matter.
7.1.A demonstrate safe practices during laboratory and field investigations as outlined in Texas Education Agency-approved safety standards
7.12.B identify the main functions of the systems of the human organism, including the circulatory, respiratory, skeletal, muscular, digestive, excretory, reproductive, integumentary, nervous, and endocrine systems;
We will apply chemistry to daily life.
I will identify factors that contribute to dental health.
You should brush your teeth 2 times a day, for 2 minutes each.
1. Watch video.
2. Review vocabulary and complete quiz.
Chemical change A type of change in which a new substance is formed. For example: releasing heat or light energy.
Plaque A sticky layer of bacteria (germs) on teeth that can cause tooth decay
Tooth decay Permanent damage to the surface of a tooth caused by plaque bacteria
Fluoride A substance found in toothpaste, some mouthwash and some tap water that strengthens teeth and prevents tooth decay
3. Soak an egg in dark cola.
- Gently place two hard boiled eggs into a cup of dark cola, like Coke or Dr. Pepper.
- Do you remember what happened to the egg you placed in vinegar?
- What do you think will happen to the egg after 24 hours in the Cola?
- Make a hypothesis.
4. Pierce an apple.
- Use a pencil to make a hole in a apple. This will represent a hole in a tooth made by decay.
- Put the apple in a paper bag.
- Place another apple that has not been pierced in a second paper bag.
- Leave both bags for 24 hours.
- What do you think will happen to the apple with a hole in it?
- Will it be different from the other apple tomorrow?
- Form a hypothesis.
OPTIONAL Try the peanut butter glove demonstration.
CAUTION: Make sure nobody present is allergic to peanuts.
- For this, you’ll need a rubber glove, peanut butter, a spare toothbrush, toothpaste and dental floss.
- Put on the glove and smear peanut butter between your fingers.
- Hold your hand up in front of you like you’re about to high five, with all of your fingers held tightly together and pointing upward.
- Your fingers represent teeth and the peanut butter is like the food and bacteria that get trapped between them throughout the day.
- Use a spare toothbrush and toothpaste to try to clean away the peanut butter from between your fingers while keeping your fingers tightly pressed together.
- When you’ve finished, spread your fingers apart to show how much peanut butter is still stuck between them.
- Pressing your fingers back together, try to use floss to clean the peanut butter from between your fingers.
If you’re not too grossed out, have a snack of sliced apples and peanut butter.
Speaking of teeth…
What do you call a grizzly bear with no teeth?
A gummy bear
5. “Duplicate of Healthy Teeth Brushing”
