How to Make Elephant Toothpaste Science Experiment Using Yeast

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We’ve all seen those cool explosive science videos where Elephant Toothpaste grows bigger than the kids. But how do you make elephant toothpaste? And what happens if you modify this science experiment? It’s not nearly difficult as you might have expected!
elephant toothpaste science experiment
Below I’ll tell you exactly where to get your supplies for this fun science experiment at home! I promise it’s not complicated! We should have been making elephant toothpaste a long time ago! Although potassium iodide is used for a big WOW factor, using yeast is more kid friendly! 
One year my son’s science fair experiment was measuring the heat given off due to the chemical changes when altering the percentage of hydrogen peroxide used in the recipe. It was pretty cool and they had a blast making elephant toothpaste over and over again! For “scientific purposes” of course!
teenage boy doing science experiment

What materials do you need to make Elephant toothpaste?

  • warm water

  • hydrogen peroxide (see notes below)

  • food coloring

  • soap (Dawn works great!)

  • yeast (the little individual packets work great!)


**A Note about Hydrogen Peroxide:**

You will not be able to walk into Walmart or Target and just pick up different percentages of hydrogen peroxide for the elephant toothpaste science experiment! You will need to visit Sally Beauty or your local hair salon store. See notes below for “Proof” amounts.

How to Make Elephant Toothpaste:

teenage boy elephant toothpaste

  1. In a separate small cup, add 3 Tbsp. of warm water and 1 Tbsp. of a dry yeast packet. Let it sit and mix for about 30 seconds to activate the yeast.

  2. Add a half cup of 20 Volume (or 6%) hydrogen peroxide into your water bottle or Erlenmeyer flask if you have access to one.

  3. Next add 8 drops of food coloring into the peroxide. This is an OPTIONAL step if you want to have colored foam!

  4. Add 1 tablespoon of liquid dish soap (Dawn works great!) into the bottle or flask and gently tilt the bottle around a bit to mix the soap with the food coloring.

  5. Lastly, pour the yeast mixture into bottle and watch the reaction!

*There are other recipe for Elephant Toothpaste out there but this is the easiest supplies to access to make this science experiment at home. If you have extra ingredients let your kids do their own experiment and tweak the ingredients to see what gives a bigger reaction!

Experiment Expansion:

Try changing the amount of hydrogen peroxide solution and use an infrared thermometer to measure the heat given off! Try 3, 6, 9, 12% hydrogen peroxide solutions – all found at Sally Beauty.


Watch the WORLD’s LARGEST Elephant Toothpaste EXPLOSION!


(You can also see Mark Rober’s world’s largest devil’s toothpaste explosion here. He has a phenomenal YouTube channel.)

Why is it called Elephant toothpaste?

This science experiment is called Elephant toothpaste because when the foam bubbles up it looks like toothpaste squirting out of a tube! The reaction is so big that only an elephant would use toothpaste that size!

Is Elephant toothpaste safe to touch?

If you’re using our Elephant toothpaste with yeast recipe it’s safe once the heat reaction has cooled off. Due to the chemical reaction of elephant toothpaste the internal temperature can soar pretty high. However as you can see in the photo above my son had no problems handling the foam once it escaped from the container.

More STEAM experiments to enjoy:

Marbled Milk Explosion Artwork Experiment fire snake science experiment
magnetic slime recipe photo tutorial colorful STEAM art sand activity



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One Comment

  1. Wow! That's pretty cool! Where do I get Potassium Iodide?? Also, what do you use to clean up this experiment?

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