Some weeks ago, students from 4ºA & B did an experiment to check how importance it is to wash your teeth at least three times a week.
The experiment was developed with eggshells (similar to teeth in composition of calcium).
They put 3 boiled eggs in 3 different liquids (coke, orange juicea and water), after 24 hours immersed in the liquids they could check the change in color and dirtiness of the eggshells and so they brushed them to try to clean them.
CLICK HERE TO WATCH SOME PHOTOS RELATED TO THE EXPERIMENT
https://photos.app.goo.gl/UdwP7wC6svNESZWQ7
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