…and the results are in! As many of the children predicted, the fizzy drink had an adverse effect on the egg-shell (our teeth in this investigation) with a large amount of discolouration and some flaking occurring. Coffee also caused a lot of discolouration. However, the affect of the vinegar was a surprise. It dissolved the egg shell completely, leaving only the membrane – resulting in a slimy, squishy egg.
The milk left a thin white film on the egg shell but caused no damage and the egg in the water remained unchanged.
From these results we concluded that fizzy drinks and vinegar were the worst liquids for our teeth as they caused the most decay.