Teeth bygiene is important for our health and daily life. Food and drinks may damage our teeth. To see their effect do the following activity: 1. The shell of an egg has a structure similar to our teeth. Take five eggs and different drinks (coffee, juice, tea, water, coke) and five glasses. 2. Put eggs and drinks into glasses. Ohserve them with magnifying glass daily. Make observations for one week 3. Write a report about your obwervations