Science on Stage
What is Science on Stage?National activitiesInternational festivalsHow can I take part?History of the projectEuropean Science Teaching Award Winners
Teaching Ideas
About us
OrganisersNucleusContact us
Chemistryprinter friendly page
How does toothpaste work?
How does Toothpast work?
Subject Chemistry
Level Lower secondary
Language English
Type Experiment

Bacterial suspension is inoculated on the Petri dish, but toothpaste can stop the bacterial growth.

Bacterial suspension is inoculated on the Petri dish. One day later, a hole is made in the middle of the agar plate and filled with commercial toothpaste.

Two days later, you can see a distinct zone around the toothpaste, where the bacterial growth is eliminated due to chemical compounds from the toothpaste diffusing into the agar medium.
Contact details
NameOndrej Koukol


More Chemistry Teaching Ideas
DNA Extraction from Kiwi FruitTeaching Science and HumanitiesICT in ChemistryThe Particularities of Chemistry Teaching in LuxembourgWeb Chemistry: SweetenersThe Shadow of the FlameLooking for Antioxidant FoodDiscovering an Accessible EnzymeNatural AntibioticsSome Simple Demonstrations in Classroom
   Science on Stage