Did you know?
Even in ancient Egypt, people suffered from tooth decay. They certainly did not know the actual cause, but they still tried to clean their teeth by chewing on branches of the toothbrush tree. People have also been using natural oils and other plant substances to care for their skin and hair for thousands of years. Today, systematic scientific research and development are behind the cosmetic products we use every day for our health, well-being and beauty.
Experiments related to personal care
Quiz
What is the name for the skin that covers over 95 percent of the body's surface?
Answer
The hairy skin makes up the largest part of our skin surface.
Does sugar cause caries?
Answer
No. Sugar in itself does not cause cavities. Bacteria on our teeth turn sugar into acid, and that is harmful.
What floats on top: water or oil?
Answer
Oil floats on water because it has a lower density.
What do shells, marble and teeth have in common?
Answer
They all contain calcium compounds that are attacked by acids.
