Fun Science : How To Make “Elephants Toothpaste” Experiment

Ever wondered how to make elephants toothpaste? (Ok, it’s not scientifically what elephants use to clean their teeth but the effect looks like what might happen if elephants did use toothpaste). What it actually in this experiment is a chemical reaction which causes a rapid expansion of foam, enough for an elephant!

Warning! Hydrogen peroxide is extremely dangerous and adult supervision is required throughout the experiment. Gloves must be worn at all times!

You will need:

1/2 cup of 20% hydrogen peroxide liquid (sold in beauty salons), 1 TBS of fast acting dry yeast, 3 TBS warm water, 1 TSP washing-up liquid, Food coloring, Rubber gloves, Empty plastic bottle.


Safety first

#1 – Don the rubber gloves and if you have any, some goggles! This practice should be used before any Fu









Food coloring of your choice

#2 – Pour the hydrogen peroxide into the empty bottle (you might need a funnel here). Add 8-10 drops of a food coloring of your choice.




Just a teaspoon!

#3 – Add the washing up liquid and sloosh the bottle around.








Frothy yeast

#4 – In a separate bowl, mix the yeast with the warm water for about 30 seconds, or until it starts to go frothy.











#5 – With the bottle on a safe, hard surface (preferably outside) pour the warm yeast mixture in to the bottle and stand well back!

Have fun with this easy experiment which shows the reaction that occurs when hydrogen peroxide is  mixed with washing up liquid. A catalyst, in this case yeast, is added to make the hydrogen peroxide decompose very quickly. Hydrogen peroxide breaks down into oxygen and water. As a small amount of hydrogen peroxide generates a large volume of oxygen, the oxygen quickly pushes out of the container. The soapy water traps the oxygen, creating bubbles, and turns into foam. Please be careful when handling chemicals. Let us know how you get on!

Fun Science