Teeth and Digestion - Egg Shell Investigation

The children set up an investigation to find which liquid weakened the egg shells so they could link it to tooth decay.  The children left the eggs in the liquids for a week and predicted which egg shell would be the softest at the end.  The egg shells were tested to see how hard they were and which liquid did the most damage.  From this the children discussed which liquids they would drink more of and which ones they would drink less of to help reduce tooth decay.