Using models, he demonstrates how bacteria stick to teeth, form acids and dissolve away some of the mineral matter causing cavities. Using several different models, he demonstrates how the structure of the water molecule gives all snowflakes a six sided crystal, yet because of the way these molecules attach, each crystal is different. This weeks technological failures include a water broom and a sun tan lotion sprayer. Peggy Knapp joins naturalist Nancy Gibson as they take a close-up look at the Arctic Fox, a small carnivorous mammal who is uniquely adapted to living in the tundra environment. Then, all of a sudden, every motion associated with eating and drinking becomes a painful experience.
Teeth do more in our mouths than just chew food.
They form the overall shape and structure of the mouth and they provide us with the first critical step in the digestion of food. All teeth are divided into two main parts. The part we see is called the crown which is where most cavities happen. Below the gumline is the root, which anchors the tooth in the mouth. In the center is the living pulp which is connected to tiny blood vessels and nerves.