For Dental Health/ Teeth theme. An activity page to go along with a science experiment illustrating the answer to the questions "Why Do We Brush Our Teeth?" Children first draw what they see when shown a plain white hard boiled egg. They also draw a picture of an egg soaked in Diet Coke over night. After this activity it is always fun to give the kids a brown egg, a toothbrush and a little bit of toothpaste and let them brush the egg clean!