Taking care of our teeth experiments

We want to check how good or bad certain drinks are for our teeth.

We put a small amount of eggshell (because it is made like a tooth) into each container and added orange juice, vinegar, blackcurrent juice, water,7up or lemon.  We will leave these for a few days and see what happens to the eggshells.  We think that water will be the best for our teeth, and that 7up or vinegar will be the worst because we know these are acids.  We kept this test fair by using the same size eggshell in each cup, and the same amount of liquid in each cup.  All we have to do now is to wait and see!

Next we tried another experiment.  We want to see what exactly toothpaste does.  Teacher half filled 2 small bottles with vinegar and put a stick of chalk in each. Into one container she also put a squirt of toothpaste.  Then she stretched a balloon over each bottle.  We had hoped to see the orange balloon fill with gas because the vinegar reacts with the chalk to give off a gas (Carbon Dioxide).  We thought the green balloon would not blow up because the toothpaste stops the vinegar reacting so well with the chalk.  In actual fact neither balloon blew up, but we will leave this experiment another day or two to see does the reaction happen slowly.